Me and All Hotel Ulm, by Hyatt

Location

A practical base for work trips, conferences, and short business stays.

Verdict

Would stay again

Location is key when selecting a hotel. This one is directly across the train station. If Ulm is on a "Rail Trip Across Europe" trip, this is an amazing spot. Judging from appearance of the others eating breakfast "quick business trip to Ulm" is more likely. Still an amazing location if that's the case.
If you're here on business you're probably flying solo, in which case the lack of privacy in between shower / bedroom won't bother you much. In fact you may even realize as the architect did, this is a very efficient use of space. If you're of the former example, the rooftop bar is a nice place you can go in case you need to vacate the room for a little while.
The rooftop bar has monkeys climbing through the walls of plants they have. I think the plants are for the ambiance, no evidence of any carbon credit harvesting schemes here. They also have a smoking area up there, with clear house rules posted.
The same area functions as the breakfast area in the mornings. It gets high points for presentation and the vegan meatballs are 👨‍🍳💋👌. The outside space is also nice, but not usable every day. Rooms also have full height windows, but you may not see so much due to the facade and the fact the property is located within a block of other buildings. The train station side views are nice though. They're also a Hyatt property so count for your +[n]

TLDR: The building suffers from a case of over-inspired architecture resulting in a questionable hard product but I would stay here again. Hyatt affiliation + close to train station + low price override a lack of bathroom walls for me.