Oscar's mother met us to show us around the apartment. She was very friendly and helpful. The flat is spacious and nicely decorated (exactly as the pictures). It is also very conveniently located - 5 mins walk to Karlsplatz U-bahn, and easy walking distance to many sights, including Stephansdom and Belvedere. The only downside was that the flat is very noisy with the windows open (it was hot during our visit, so we had to have the windows open at night, but all needed earplugs in order to be able to sleep). An extra set of keys would also have been helpful (we were 3 people with independent schedules but only 2 sets of keys so this required some logistics at times!).