If you are going to Vienna, I would highly recommend Nikolay's place. He was very flexible with check-in and check-out meaning that our early arrival was no problem and we could leave our suitcases on our last day and not worry about a luggage hold . It was very very clean, the bed was very comfortable and it was so close to the metro line that takes you straight into the city centre. There was nice touches, such as snacks, coffee and milk. One of the nicest airbnbs's I've stayed in and would happily stay again.