My girlfriend and I stayed at the Bavaria Boardinghouse for 3 nights, and it was exactly what we expected. The place was clean, neat, and fairly spacious for 2 guests. The location was excellent, as it was a 20 minute walk to the city center, or a quick 2 stop metro ride. Nicholas was extremely accommodating, and even checking in late at night went flawlessly.
We did have a few difficulties, our flat was on the 3rd floor and during the summer the room got a bit hot during the night. We also were on the corner street side unit which was exposed to all of the street noise throughout the night. This made sleeping a challenge as it was hot and noisy. The street noise was difficult at times as one of us is a light sleeper, if you are a light sleeper I would advise you to request a room on a higher level. Overall, this AirB&b is a great choice for the value.