I enjoyed my stay at Maria's place tremendously - the room is really large and comes with sofabed and working desk. The area is filled with nice and cheap restaurants, bars and nightlife, and you can reach the nearest subway station within 2min walking distance. All in all it was a wonderful experience and I recommend the place to everyone looking for a nice and authentic stay in Berlin!
One word of advice though: The room is indeed very bright, so if you have trouble sleeping better bring your sleeping mask :)