You must immediately inform Housing Vienna about it. Unfortunately, a key lost fee (se your contract) is to be paid if you lose your keys. So, be careful!
Address: Mariahilfer Strasse 84/4/41, 1070 Vienna
Phone: +43 1 276 30 21
All e-mails are handled within 24 hours
Monday and Thursday: 12-14 h | Wendesday: 10-13 h
Tuesday, Friday, Weekends and Holidays: closed