I have lived for six months in Micheal's apartment and I am extremely happy of this choice.
It is located in a nice neighbourhood, only 20 minutes walking to the centre. If you are working at the university the location is perfect, since you can reach many departments on foot in 10-20 minutes. There is also a small supermarket just outside the door, and many other shops, bars and restaurants nearby.
Even if the building is in front of a U-bahn station and a street with lots of traffic, the apartment is not noisy at all; the bedroom has a window on the internal yard, so you can sleep quietly.
The rooms are very spacious, bright and ventilated. The kitchen is functional and has everything you need to cook complete meals. The only small issue I had was the wifi: the signal does not reach all the rooms uniformly and is sometimes unstable. If you make a videocall you might lose connection for a few seconds, but besides that it didn't create me any problems.
Micheal works every day in the shop downstairs so he is always available to solve any kind of problem. The check-in is extremely flexible: you can arrive at any time, also in the night, and you can get the keys from a small safe, locked with a secret code that you will receive in a private message.