We had a great stay at Ferdinand's apartment. Great location on the Danube - walking distance to the centre and ten minutes walk from two main stations (Wien Mitte and Praterstern), a stone's throw from Hundertwasser Haus and 15 minutes drive from the airport.
The flat itself is a beautiful old Viennese style flat with high ceilings but very modern, stylish and clean.
When we arrived, there was scaffolding up for painting but this only lasted a day and our host gave us some wine as a gesture. Mannerschnitten on arrival were a lovely touch!
Note that the flat is on the first floor- accessed via stairs / a lift but there are some steps before the lift.