The location can't be beat -- coffee, bars, restaurants, U-bahn, and ice cream a stones throw away. On the canal (alas no canal view from inside, though). Nicely in between Neukoln and Kreuzberg.
It is comfortable, clean, and everything works (gotta love those German windows that open 2 ways). It's rather small, just a bedroom, mini kitchen, and bathroom, but it is very cozy.
The fact that my biggest complaint is that there is a squeaky spot in the floor says it all.