Nikola was a very good host, he always replied quickly to messages and appeared in person if necessary. The apartment has everything you need for a short stay in Vienna. It is located in a very good location, 5 minutes from the Arthaberplatz tram stop and 6 minutes from the Reumannplatz underground line. The very center of the city can be easily reached in 20 minutes. There are three large shops nearby (2x Billa and Aldi/Hofer). We stayed at Nikola's flat in 4 people (parents + two children 11 + 6 years old). Dual-function gas boiler + 3 radiatora and a wall-mounted controller creates the set responsible for heating the flat. This system easily manages to maintain the set temperature inside.