The hotel was super clean and modern. Facilities felt new and all worked very well. The front desk staff were helpful and friendly, and the location is great - far enough so you don't pay Old Town prices if you're there as a tourist, but extremely well connect so that you can be Marienplatz within 15 minutes of leaving the hotel.
Just to be aware - I would not stay there as a solo traveler. There are no peepholes in the door, and no deadbolts/chains on the door. It's also impossible to tell from the inside if the door is actually locked. However the area and the hotel felt safe - I just personally wouldn't want stay there as a solo female traveler without these safety mechanisms.
The room is quite small but this isn't uncommon in Europe and as it's all up to a great standard, no real complaints. However there is no coffee maker or kettle in the room which would have really made the room perfect.
All in all I would recommend MotelOne, with the provisos above.