Myself and two friends had a lovely time in Vienna staying at Harry's apartment which was enormous. It was well heated and very clean the only issue would be if a bigger group of people stayed as there is only 1 toilet. He was very helpful if we needed any help and responded promptly. We walked everywhere but found directions to sights from the apartment not very clear until you got to the main attractions. But despite this found Vienna to be very beautiful especially when it snowed and had a big café culture so plenty to eat and drink.