The place cannot be in a more central location, the St. Stephen's cathedral is just arround the corner. There are a lot of nice restaurants nearby, the metro is very close too, in case you need to use it, but most of the highlights of the city are in walking distance. The room is spacious and has everything you need for a couple. The host was quick to respond and check in and check out was smooth and easy.
The only reason I give 4 stars is the cleanliness - the towels we got had some strange stains on them and the bathroom could have been cleaner. Keep in mind that the wifi provided is not a private wifi but a public one, so it is not with the best quality.
Overall our experience was very, very nice and we cannot imagine a better location right in the heart of Vienna.