Urban Pixie/Pixie Pact Familiar v2

This is an update to the pixie pact familiar I constructed based on the feedback I received in the last thread. I also added some additional fluff to give the familiar a place in the world outside of Pact of the Chain Warlocks. As before, I'd love any input on how balanced for suitable everyone thinks this is. Would you allow it in your game? If so, why not? What could be tweaked?

THE URBAN PIXIE
Size: Tiny Type: Fey Alignment: NG
Speed: 10 ft., fly 30 ft.
AC: 15 Hit Points: 1 (1d4 - 1)
STR 2 (-4)
DEX 20 (+5)
CON 8 (-1)
INT 10 (+0)
WIS 14 (+2)
CHA 15 (+2)
SKILLS
Persuasion +4, Perception +4, Stealth +7
SENSES: passive Perception 12
LANGUAGES: Common, Sylvan
Magic Resistance. The urban pixie has advantage on saving throws against spells and other magical effects.
Innate Spellcasting. The urban pixie’s innate spellcasting ability is Charisma (spell save DC 12). It can innately cast the following spells as though they were a 1st level caster, requiring only pixie dust as a component.
At will: druidcraft, vicious mockery
Supernatural Learner. The urban pixie knows three additional languages and/or tool proficiencies, which the DM should select based on the local culture or the pixie’s personality. Once these choices have been made, they cannot be changed.
Speak with Animals. The urban pixie is able to comprehend and verbally communicate with beasts. The knowledge and awareness of many beasts is limited by their intelligence, but at minimum, beasts can give information about nearby locations and monsters, including whatever they can perceive or have perceived within the past day. The urban pixie might be able to persuade a beast to perform a small favor for them, at the DM’s discretion.
ACTIONS:
Superior Invisibility. The urban pixie magically turns invisible until its concentration ends (as if concentrating on a spell). Any equipment the urban pixie wears or carries is invisible with it.

LORE:
All pixies are curious of other creatures, but only the bravest are able to set aside their fears and fully embrace a “civilized” life. These urban pixies, often mistakenly called “tavern sprites”, have managed to set aside their fears of bigger folk in a desire to see, hear, and learn about the world outside the feywild forests and secret glades that pixie’s call home.
Urban Magic. Being naturally magical creatures, long term exposure to the mundane hustle and bustle of the city has a detrimental effect on pixies. Over time they lose a great deal of their innate magical prowess, a prospect that many “wild” pixies find truly frightening. However many urban pixies claim that a pixie can never lose it’s magic, their magic simply changes along with them. Indeed, urban pixies seem to have an almost supernatural knack for picking up new skills or learning new languages; quickly allowing them to become clever merchants, talented tinkerers or even skilled thieves practically overnight! That said, it is impossible to truly remove a pixie’s connection to the natural world; and many urban pixies spend no small amount of time tending to the vines, toadstools and flower pots that dot their surrounding neighborhood.
Natural Guides. Naturally curious and prone to flights of fancy, it doesn’t take long for a pixie to learn the lay of the land; even if that land happens to be a bustling metropolis. To a pixie, every nook, cranny, and alleyway of a city is a potential place for a game of hide and seek. While every rooftop terrace or open-air merchant’s stall is a treasure trove of new and interesting things to see. Much like their “wild” counterparts, urban pixies make for knowledgeable and thorough guides to those looking to traverse the pavement and back alleys of a city.
A Bar Keeper's Best Friend. Due to their central location and high likelihood of containing new and eccentric individuals, it should come as no surprise that many urban pixies find themselves drawn to the noise and merriment of taverns and inns. Many pixies even find work at such establishments, as it would be a foolish barkeep indeed to turn away someone willing to work for a fraction of the food, board, and coin that a typical worker would ask for. Likewise, many innkeepers quickly learn that when dealing with a pest problem, having an employee who can simply ask the pest to leave saves no small amount of time and money. Despite their small stature and tendency to get distracted on the job, many consider urban pixies to be some of the best workers in their employ.
Swords of Slander. Amongst the lands of the bigger folk, urban pixies quickly learned that the cut-throat streets of the city are no place for someone who cannot stand up for themselves (even if they stand only ten inches tall); so as creatures that abhor physical violence, this created quite a problem. Thus they turned to words and insults to fight their battles for them. Quick learners with imaginative minds, it doesn’t take long for an urban pixie to collect quite an extensive library of colorful, humorous, and often magically laced insults to sling at those who cross them. Many an unruly bar patron has been reduced to drunken sobs by the sharp tongue of an otherwise kindly pixie they’d offended.

EDIT: Removed the Streetwise skill because it doesn't exist. Oops!