Some questions about booking taxis from the airport to my hostel

Hi folks, Ill be arriving in Barcelona at midnight and looking to get to my hostel easily (About 10 min away from Sagrada Familia). I would generally prefer public transport but as someone whos never been to Barcelona and arriving around midnight, I would be a bit concerned about safety so would prefer just getting there without any hassle. I would like to have an estimate of the fare beforehand since its quite a long distance. Im not exactly sure how taxis/ubers work in Barcelona, but I cant find specific names for the taxi services to check them out, I see FreeNow mentioned in a couple of places on the web, would that be best? Appreciate any advice!