I needed a room for a one-month German course in Munich and, after a long search, I found one in Pension Doria. My month in Munich has just finished and I'm absolutely happy with my choice. The pension's location is really exceptional (close to LMU and the centre, where is very difficult to find a place) and the price is relatively cheap (€ 690 / month). The service is also excellent: rooms and bathrooms are very clean and the owner is kind and friendly.
If you need a room (without kitchen) for a short-term stay in Munich, I warmly recommend Pension Doria.