My girlfriend and I had a nice month in Berlin. Overall we enjoyed our stay and we found a nice and quiet apartment. We think there are a lot of good aspects of the flat, and Lisa as a host, but there were some things that could be better.
Things we liked about the apartment: the neighborhood is quiet, pretty, we are very close to the canal and Treptower Park, there are some nice cafes and restaurants ; the bedroom is large and quiet and has nice furniture ; Lisa let us bring our cat ; the roommate is nice, respectful and clean ; the kitchen is well lit, large and tidy, which lets enough room to invite people over ; communication is easy with Lisa ; there is a really good yoga studio down the street.
Things we didn't like : the place is not close to any metro, so we recommend to rent a bike for long stays ; the internet is slow, this internet can't support downloading and working with large files ; we didn't have a second set of keys for two weeks, however Lisa did work on the problem and fixed it, which was not easy ; the advertisement in english didn't mention a roommate, so we didn't know about the situation until after we paid, so be careful about the description.