Stravoula and Klaus's place is absolutely fantastic! The room we stayed in was nice and toasty, very comfortable, cosy and in a great location. There was a large kitchen with comfy sofas and you can make full use of the kitchen equipment ( I toasted some crumpets in the oven). There is also free food in the fridge and on a shelf - and this is actually good stuff you can make use of! The bathroom is very nice - good shower, very clean, lots of space and large bathtub too. There are lots of additional items in the flat like books and board games if you want to have a chilled evening in. The flat itself is located very close to Westbahnhof station, and you can easily walk into the city centre.
Strevoula and Klaus were fabulous hosts and gave us lots of tips on where to go in Vienna, what to eat, what to do etc. We visited the Christmas markets, went ice skating outside the city hall and went to Therme Wien. On our last day in Vienna, they were kind enough to let us leave our bags in the accommodation and come back to pick them up later that evening.
Overall, this was a fabulous and cosy place to stay with very caring hosts. I highly recommend it!