We spend 4 nights in Leon's apartment and we could not be more happy that we did so. Leon is a splendid host and the apartment is great. It offers everything you need and even more. It is comfy, clean and fully fitted (e.g. toiletries). It also includes a variety of cereals and an espresso maker for daily breakfast. We had not had any problems at all due to the fact that Leon is a caring and dedicated host.
Visiting Vienna and staying at Vienna Calling is highly recommended - we would come again anytime.