I spent one night in Alex's apartment in a group of five friends. The apartment was perfect for us with its three separate rooms. The location is very nice, in a quite area close to the main attraction. Even if the metro it's just 5 min walk, we went to Marienplatz in 30 min by walk and we had a pleasant path. For breakfast, there is good bakery 10 min walk in the same street.
The procedure for finding the apartment keys is "the DaVinci Code" style, so it is strongly recommended to print the instructions!