I didn't know the room did not have air conditioning until check-in. Fortunately I was able to upgrade to a different room for €15 per night. It was a little frustrating because I was originally told that the upgraded room was only available for 3 of the 4 nights. Right as I was about to cancel the fourth night, I was suddenly allowed to keep the room.
The staff were friendly enough, the hotel was very quiet, and everything was very clean.
I would stay here again, but only in a room with air conditioning.