The flat is situated at a quiet neighborhood, next to a park and with good connections to the local transportation infrastructure. The nearby park is excellent for jogging and many other sport alternatives. A small disadvantage is the lack of an elevator in the building, which makes the carrying of big luggage for more than a week a bit uncomfortable.
The flat on its own is very well sound insulated and warm and provides a good possibility for cooking your own food. We were three of us in the flat, each of us with his/her own room, but for more than 4 people it will be too tight.
Our host Fai was very easy to reach and contact and there were no problems during our stay. I can only recommend the flat for people, who would like to visit Berlin and have a nice relaxed flat for their stay.