I stayed a long time at Hellen's place (1 month) which is quite unusual but it was really nice there. The room is very spacious, modern, clean and bright. The house is located in a calm neighborhood where the guests can easily park and for free! With the bus and/or U-Bahn it takes around 30 minutes to reach the city center. Hellen and her husband are nice and always helpful if you need something, I definitely recommend them for your stay in Munich!