Siegfried's flat is perfectly designed for groups of 3 or more, and is really good value for Vienna. The neighbourhood is diverse and well-connected by tram to the city centre, and there are both supermarkets and open-air markets in easy walking distance. The flat itself was super-clean, flooded with light, and well designed, with bedrooms on an upper floor and kitchen/diner/sitting room and bathrooms on the lower floor (that is, the third floor of the building). Crucially for summer visitors, there are powerful air conditioners in both bedrooms, while the lower level is reasonably cool even on very warm days, due to large windows and shades to reduce the sun. All three of us would definitely stay here again if we're back in Vienna.