M & C's place is clean, tidy and you will find anything you need for your stay (towels, coffee maker, wifi,...) The location is close to the main attractions and to the danube canal for a stroll. Restaurants and bars are also close by. Cloud is a great host and shared tips for hidden gems in Vienna.
The only drawbacks are the humidity and smell in the apartment, as well as the neighbor next door whose kid can be very noisy and start shouting at any time in day or night.
But the overall stay was very nice and I would recommend to choose M&C as hosts.