Bernhard and Kiki’s place worked well for me as a single person, but might be a bit tight for a couple. I was out and about most of the time, and the location close to the U-3 gave me great access to Vienna’s excellent public transit system, even though the apartment itself isn’t all that close to any tourist attractions. The bakery across the street is a gem, with very helpful staff and great baked goods. It’s closed on Sunday and doesn’t accept credit cards.