It is a great place. It has a heated floor, comfortable bed and very good heating system. The location is excellent and in a 5 minutes walk you are at the U Line 1, where you can get the public transport to anywhere in Vienna. The building is a bit old but the flat probably has been refurbished recently. It is shining and clean and the host left some good refreshments, snacks and tea for us. The bed sheets and towels were also clean and the shower had no signs of mold or dampness. I'd definitely come back.