I stayed here for 12 nights on a business trip and had a very pleasant stay. 24-hour desk staff were friendly, very helpful, & spoke excellent English. Room wasn't particularly large, but quite adequate, and quiet. Superb free breakfast with a zillion choices. In-room ethernet or wireless internet is available, though not free.
Nice little pizza restaurant ("Mixto") next door - crispy-crust pizza by the slice.
Directions: A 5-minute walk southwest of Sendlinger Tor U-bahn station (U1, U2, U3, U6, U7). Only about 15-20 minutes to walk to Marienplatz (or take U3 or U6).