Oliver's apartment is beautifully decorated and quality furnished, and perfect for a couple. The apartment is a loft type, with kitchen, dining table, sofas, TV and bed are all in the same space....but it is really really very spacious. Everything was new, great bathroom, and big and supercomfortable bed. The kitchen is really well equipped, and Oliver and Olga were so nice to leave milk, bread, coffee, tea, butter, ... Also communication with Oliver and Olga was great and friendly making everything easy for us. You can tell that they truly want you to enjoy and be happy there.
Being our first time in Berlin, we though that maybe we were not close enough to the city centre, but this is only an advantage, because in Berlin you are always going to need to get the train or underground -or use one of the handy city-bikes- and we liked the non-big-city feeling of the area, and it also has a very nice vibe. The apartment is in a quiet place, but 5 minutes walk from lots of restaurants, bars, etc..
We would repeat at Oliver's apartment next time in Berlin, eyes closed!
We really recommend Oliver's apartment for anyone's stay in Berlin