TLDR: the Ryanair of hotels. Some good deals to be made, but be careful.
The price for my room (no window) over my 4-day stay averaged out to 52€ per night, and I expected to stay in an entry-level “normal” hotel for this price. I also on occasions stay in youth hostels, which are usually cheaper than this but where one needs to adjust expectations in consequence.
In fact, in this hotel and contrary to my expectations, the room was too small to be comfortable, there was no table or chair in the room and only the equivalent of two towel hangers were available to let clothes straighten up. The bathroom was in a state of relative disrepair. In summary, this was more similar to a king of well-located youth hostel with a twist.
In fact, as I only noticed after paying, the price of my room was ranging from 30 to 90€ per night. It is a fair deal at 30€, and I'd recommend it at that price to someone who knows what to expect for 30€.
Also, it only became clear to me after paying that while wifi is available at the hotel, it is an extra at 5€/day.