I have stayed in Kypseli multiple times in different locations (all using Airbnb) and can say that this is an awesome place to stay if you are looking for an authentic experience within Athens/Kypseli area :)! Marinos is a great host and is extremely responsive and helpful. The flat is literally a 20 seconds walk from both a supermarket (that will have all your needs), as well as a nice souvlaki place for when you want to get takeout for dinner (I recommend the chicken pita kalamaki with tzaziki sauce!). The flat itself is a cozy and intimate space in a safe neighborhood, perfect if you are traveling alone! I will definitely book here again when I am in Athens again in the future!