I enjoyed my stay.
Close to the city center, easily accessible apartment. Very effective check-in procedure, but you need internet access to enter the apartment. The place is super-clean and the host is friendly and helpful.
There are some inconveniences, though. Located right at the entrance to the building, you hear the entrance door and everybody walk in and out, so you should probably take a pair of earplugs to sleep well. Also the stairs are a bit of a high risk, definitely not for the elderly/infirm/parents with children.
Overall impression: good enough for an overnight for a young guest.