We had a very nice stay in Albert's flat.
The apartment is super clean and had everything we needed for our time here. Albert is a very nice and obliging host, he welcomed us at our arrival to explain everything we needed to know and was here for our departure (despite the early hour).
The flat is conveniently located, with many public transportation within 5min walking (bus, metro) and you can easily reach the center of Berlin. The neighborhood is quiet and lovely.
Definitely a good place to stay at!