On the bright side: flat is very clean, offers all necessary equipment, good heating, plumbing new, as described, close to city center + many public transports leading to museum and opera area. Host had nice communications and self-entry was easy.
On a lesser note, and this a matter of personal taste: "charming" is not my prefered adjective for the flat, which probably was a former shop, leading directly onto the street (also its windows) and is rather cold in decoration and lighting. 1st sleeping space upstairs sits on a mezzanine leading onto living space, 2nd downstairs with opened sofa + additional mattress (comfortable), wonder about space for a 4th bed.
Area is indeed lively in one side of street, on the other side more of new buildings, no charm.
Beware that indicated closeby airport bus does not yet re-operate (3/22) you might have to design your own alternative route.
All in all ,an OK stay for a few days.