Opernring 23 is a fabulous location, close to all the sites, the tram and the underground. The apartment is fully equipped, spacious, very comfortable, and clean clean clean. We just loved the 15' ceilings and super tall windows with cross ventilation. The apartment is very bright day and night. The only downside is we faced another building's windows about 30' across a courtyard. Quiet, but you had to look way up to see the sky.