The stay was not bad overall, but:
1. The room is quite small and super basic. For example, the window is quite dark but not completely. Also there was an intermittent beep going on all night, and if I didn't had earplugs I wouldn't have been able to sleep. For me it did the job in the end, but for about 80 Euro / night I was expecting more.
2. I was sent the wrong instructions for the check-in. They told me to press the buzz three times to open the building's door, but that didn't work. I called the emergency number they sent me and they apologized: in fact, those instructions were not up to date and instead there was a small box locked with a combination a few meters away from the door. It was 11pm and fortunately they replied immediately, so the situation got solved within like 5 minutes, but what if I didn't have a phone? And what if it was later in the night? Would they have answered? Not great.
3. The breakfast is the most basic one you can imagine. Basically it's just some packaged rusks, single-use jam, and shelf-stable milk. I'll upload a photo.