I can understand the reviews of the small breakfast room, noise and parking. If the hotel is busy or its summer (no aircon, so it is noisy with window open) then yes it might not be that pleasant. However I've just had a great 11 night stay. And apart from saturday morning which was slightly busier for breakfast there was no problems at all.
The room was excellent for a budget hotel and I teally can't stress just how clean the place felt. Fresh fruit every day a nice bonus, reception staff were always polite and helpful and providing you don't mind a short walk of 15-20min you can easily make the station/ulm centre. Shopping nextdoor and fast food within a few minutes walk. Better resturaunts within 10-15 minutes.
House keeping starts early so if you plan on lying in past 8 in the week I'd put the do not disturb sign on. Breakfast has a good choice and room redecorated since some of the photos on here.
I might hesitate in high summer but will happily book this place againMore