Perfect location - close to underground and trams for getting all across Vienna and even out to the wineries. There are lots of great bars and restaurants in easy walking distance too.
The flat is comfortable and makes the most of the space. The balcony isn't really a place to sit out and relax for long, more a spot to enjoy a morning coffee or glass of wine after sightseeing.
There isn't much in the way of kitchen basics - we bought our own coffee rather than pay one euro per cup - but other than that slight oddness, there's everything you need for a short break.