if you're looking for an excellent and easy approachable friendly host and a "business hotel like" experience in between the locals to enjoy beautiful Vienna in one or two days, you definitely should book this appartement.
we only had 20 hours to experience Vienna on our honeymoon and Alberto made sure we enjoyed it to the fullest.
we actually didn't meet him, but he was a perfect "virtual" assistant. he responded to all our questions within minutes. he made sure the apartment met all our requests, was very clean and convenient.
he helped us with the bus tickets, parking the car (free and visible from the appartment's balcony), tips, reservations... when we look back at it, it was crazy to experience Venezia in such a short period of time. But Alberto made sure we experienced it in comfort and happiness :)