We stayed her for 4 days in while in Vienna. The staff are really friendly and very accommodating. The breakfast was really nice, full of fresh breads, fresh fruit and veg and some amazing cheeses. They also have an afternoon tea which has tea of the highest quality in a very nice salon.
The rooms were nice and quiet, the beds comfortable and the toiletries were L'Occitane which is always a plus.
The hotel is well appointed with some amazing art throughout. We actually stopped and really looked at some of the pieces which is a compliment to the owner who collects them.
We had one minor issue which the staff was very apologetic about and very quick to correct, so if you decide to stay her (and obviously I recommend it) and anything goes wrong, give them a chance to correct it and I am sure that they will do so.
Hotel Aldstadt is refreshing break from the 5 star chain hotels and a great way to get into the vibe of Vienna, quiet, comfortable and creative.