The flat is nice and despite the location you do not hear any noise from the street or else, even in the evening. The location is just excellent with perfect connections to whereever you want to get to in Vienna. Check-in was perfect. We also benefited from some toys in the flat.
In case it is of relevance: Just around the corner is a bakery and cafeteria. The large supermarket in the railway station is open until 9 p.m.