Any tips or legit websites to look for rents?

Hi guys! First time posting here. I'm moving to Germany in about 6-8 months (particularly Magdeburg). I'm looking at some websites that offer rentals but some of it look too good to be true! Can anyone helps me with some legit websites or tips to look for rents? My budget is around 200 - 700 euro per month and just for 1 person (I am okay with sharing with 3 people max). Thanks for reading and sorry if my bad english annoys u guys!