I stayed at Helen's house for about a month to perform my research in Munich. It is located at a north part of Munich, in a very quiet, safe, and beautiful residence area with nice houses. I really liked this environment. Although it takes about 15 min to walk to the nearest U-Bahn station, there are bus stops nearby, and you can use a bus to the station if you want. Using buses and subways, access to the city center (or elsewhere) is relatively easy.
Overall, the house is well maintained and clean. The room I stayed was a smaller one, so it was simple and not large. But, for a single person without much luggage, it was sufficient, cozy, and very reasonable.
Helen was an active person who likes music, growing herbs, travel, and so on. So I met her less than I had expected in her house. But of course, she explained everything necessary before/at my arrival and answered my questions. Once, she kindly asked me to have supper together, and her food was delicious.
As explained in the house rule, guests are not allowed to use kitchen (including fridge), and also, they need to go to automatic laundry to wash clothes. However, there are some supermarkets in walking distance and restaurants near the station, so I did not feel much troubled.
In short, I highly recommend her place to short to middle term guests who seeks a reasonable, quiet, and beautiful place in Munich.