The room was lovely and clean, with very good bedding, in a quiet neighborhood. The bathrooms (non-mixed) are shared with the other rooms of the same appartment but they are spacious and always clean.
The city center is around 15-20 min by foot.
Roman and Alina are very responsive and were very helpful with the check in, the checkout and gave us great recommendations on where to eat and what to do in Vienna.
I would recommend Alina and Roman's rooms without hesitation.