Both venues have restaurants offering snacks and warm meals all day.

Hotel Roomz has a restaurant offering lunch and dinner. Hotel Doppio has a bar offering snacks all day.

Marx “bier und mehr”
Franzosengraben 3, 1030 Vienna, Map
Bar and restaurant just across the road from Club Danube.
Open 09:00 to 24:00, offers cheap menus and a variety of draft beers!

Otherwise hop on the metro for just 10 minutes to have a meal in town!