The entire apartment building seems to be managed by HeyMi Apartments - it feels like it was turned into a hotel in a way. Location is just off a major U-bahn station and at walking distance to many central points of interest. The apartment is large with tall ceilings. Bathroom fixtures are of high quality, kitchen appliances and tools are of average quality, and beddings are of average quality. When we checked in, the playpen was ready for our infant (which was highly appreciated), but the sofa bed sheets for our toddler were still stored under the master bed (which we didn't realize until after asking the hosts). Hosts were responsive before and during our stay. Space heating was sufficient during our December stay. Apartment was well insulated from outdoors, but wall between living area / sofa bed and bedroom isn't well insulated. Overall a great experience, we'll definitely stay in one of their listings again next time in Vienna!