Our stay in Munich was wonderful. Klaus' apartment was very clean and easy to use. The bed was comfortable and the kitchen is good too with two burners, a fridge, and a nice radio on the table. We made soup one night as well as some eggs for breakfast. There were also some guide books/pamphlets/maps for getting to know what Munich has to offer, which we used often. The location is great, really good walking distance from the center of town with grocery and pharmacy within a block in either directions.
The only note I would make about the apartment is that the shower is directly attached to the kitchen with no full separating wall/door, so this might not be ideal for those who need more privacy from their traveling companions, but since I stayed with my wife it was pretty fun since we could talk while cooking.
Distance from the Hofbahnhof is roughly 1.75 miles, so walking the whole way will take you some time. We decided to try the U Bahn (U2) to Fraunhoferstraße, which put us very close to the apartment, but delays added 30 minutes to our journey. I'd recommend it's best to take a taxi instead to be sure, but we did take the U Bahn a second time on the way out to the station, which only took us 15 min.
Communication with Klaus was really clear and we were let in by Otto who was also very friendly and welcoming. And we appreciated Otto patiently waiting for us despite our delay with the U Bahn.
I'd recommend this place to anyone looking for a nice stay in Munich!