I have stayed in a room that resembles more of a spacious apartment than a classical hotel room. I guess that approximate size of the one that I've stayed in is around 55m2. Both rooms (bedroom and living room) were equipped with TV, minimalist design, bathroom had everything you could ask for.
Breakfast was plentiful, with variety of different vegetables, salads, fruits, croissants etc. For all shopping maniacs, position couldn’t be better given that it situated in the heart of Mariahilfer Strasse, main shopping street in Vienna. For instance, right next to the hotel entrance in the H&M store.

I recently stayed for my 3rd. time in NH Atterseehaus Wien, with my wife and daughter.
I have to mention that I try to stay at this specific hotel everytime possible when visiting Wien, due to position, room space and reach breakfast. I know the hotel is not perfect (cleanliness, internet charge, a little bit worn out etc) but it was convinient to me.
I need to mention that our last stay (January 2012) was paid in advance over 2 months ago.
For all the above I was very surprised by being informed at the check-in that I will have to make a deposit of 50 Euros, by credit card, as only a "reservation", wich will not debit my card. The reception clerk failed to make me full aware of the reason(s) why.
But my bank instantly announced me that the amount was debited. The reception clerk seems to know about the bank procedure and assured me that the hotel will send a fax to my bank after check-out, to cancel the payment.
Still, after 2 working days from my departure from the hotel, no cancellation was made by my bank.
I am very dissaponted by this hotel policy (as principle, not as amount) and my stay at the hotel was profound marked by this unpleasent event. Not to mention that the situation could be wisely managed by the hotel on present crisis time, by making me hapily spend the money in the hotel instead.
I am expecting some explanations to my complaint I wrote on the hotel's official web site.
I will not stay at this hotel and I will not recommend it anymore.

Beautiful location, excelent services.
Rich breakfast and excelent service.

We picked this NH Hotel on recommendation of a friend. Initially thought of the airport NH but decided it would be no use if we wanted to roam around the city. We booked the CAT-cab on arrival at Vienna early morning. There was a huge van waiting for us at the city CAT terminal, as we were 5 of us a car would not have done.
Reached the hotel at 6 AM and our rooms were not ready. They gave us the gym room to use, and then after freshening up we walked right into Mariahilfer strasse the main shopping street of Vienna, a very chic and happening place right in the centre of things. An underground station is also conveneintly located right next to the Hotel.
Breakfast was good, average buffet spread. The rooms were suites, enormous double rooms. Three kids in a double room, the two of us in another! The rooms had a kitchen counter with microwave and sink.
Free 24 hours coffee tea milk at the lobby, not in your room.