Two huge problems, both related to Kollmann's lack of transparency. This is an old 5-story building where ceiling height makes it more like the 7 or 8th floor of a modern building. But there is no elevator, and they aren't up front about it. It's not in the main description called 'About this Property,' and appears way way down in "fine-print" style which says, "We should mention this property does not have elevators." The vast majority of hotels of that height would have an elevator, so it's irresponsible to hide it. They put us in the attic which had a ladder to get to the bed and told us nothing in the correspondence.
The second hidden aspect is in the fact the place is in a "pedestrian" zone. What they don't say is that the closest a cab can get to the hotel is about 7-9 min. walk on cobblestone streets. Again, irresponsible.
Also, our room was awful. No windows (just roof skylights), had a musty smell of mold, the soap dispenser in the bathroom was so diluted that you couldn't even see foam when you mixed it with water, and the shower was leaky. The manager had the nerve to give us tips about using a shower (we did exactly what he suggested!) The fact is that the leak had to have been a constant because the bottom of the door to the bathroom had rotted away from moisture. The manager stayed away for more than a day, refused to see or speak to us and just wrote a defensive email without any apologies. We had to leave, but he said no to any money back.
Be warned!