For a couple, staying in a private room, it was a very poor experience and I can say wholeheartedly neither of us would ever return. There were a number of problems:
1. The biggest flaw is their booking system via Airbnb. Can't comment if its the same for other methods of booking, but on Airbnb their listing is just for a room. You can't choose double or twin, so I asked before booking if we can have a double room. The response was yes, they are available. When we arrived, we were given a twin room. The staff accepted no fault and quickly blamed both Airbnb and us for the way we booked, instead of reviewing if there is a flaw in their own system. They didn't have any double rooms available, so no solution or compensation was offered.
2. The shower... Oh dear. Cold water, the shower head was broken and spitting water aggressively everywhere from the hose, and the shower door didn't close properly, leaving a 3cm gap for water to pour out.
3. The lift was out of order. Maybe this is just bad luck, but having to carry a heavy suitcase to the 3rd (or worse for others) floor is simply unenjoyable for guests and not good enough.
4. There is no blackout or dark curtain or blind. Instead the thin blind was bright yellow, so if you are a light sleeper expect to wake up early because of the light.
5. The heating was insufficient, especially in the bathroom which was cold. We turned the heaters up to try and fix it, but they seem to be on a central timer for the whole building. So it didn't heat up very well.
Each one of these issues individually might not be such a big deal, but combined they resulted in a 1* experience. Hopefully improvements and fixes can be made.