Check in was not available from 2pm and there were a lot of rules and regulations to go through which meant we missed a tour we’d planned in Vienna, so be sure to check with Heike about check in time availability in advance.
Also, the pictures show that the room outside the bedroom, with a mini table and chairs, can be used - but take note that you cannot leave any belongings there. Your stuff must be left on the floor at the foot of the bed (she didn’t let us know beforehand).
Whilst this was stressful, the place was very clean and conveniently located.