We stayed in Yair's apartment for around 3 weeks and were very satisfied.
The apartment is spacious and has direct access to a little patio / garden.
It is fully equipped with anything for a long-term stay.
The place is very quiet as it is on the backside of the house. Zero noise and very peaceful.
The location itself is fantastic: just 5 minutes from both Kastanienallee and Oderberger Street with hundreds of restaurants and cafes.
Overall: big recommendation.