My boyfriend and I stayed at this lovely apartment for 3 nights. It was a great location to stay - very close to München OST, an easy walk to Marienplatz (about 20 mins) and a lovely neighbourhood.
Katharina was a wonderful host - she greeted us on arrival and showed us the apartment. She had sweets, bottled mineral water and espresso pods for our stay, which were a nice touch.
The apartment itself was well equipped and much bigger than the stated approximation of 21m2. It was perfect amount of space for two people.
We had a great time in Munich and we would have no hesitation in recommending this place to anyone!