We had a lovely stay at the Vienna Stay Apartments. The apartment is spacious, and clean and served perfectly for our group of five. The two bathrooms were very convenient, and the two balconies overlooking a very tranquil innenhof, were perfect. The check-in was simple and without problems, but the email we got after booking was a bit confusing in terms of the requirement to give credit card details for a deposit. After contacting the host, it was made clear that this was not required since we booked through Airbnb. The location is very convenient with U2 station right around the corner, there are shops near-by and nice small restaurants located 10 min on foot. For those with light sleep, there is a slight inconvenience that a small vibration is felt when the tram passes in front of the apartment.