The location of this apartment is outstanding. You are within 10 or 15 minutes' walk of just about anything in the old part of the city, just 5 minutes from the Naschmarkt, and across the street from the historic Cafe Sperl. There's also public transportation very close by, and a couple of grocery stores.
I think the apartment would work better for a couple who are sharing the main bed in the bedroom, which is very comfortable for either one or two people. The other sleeping area is also the dining room/living room. It can close off to make a private space for someone to sleep in (on the couch, which is OK for a single person, but it is not a foldout sofabed). However, if it's being used as a bedroom, that means there is no place for anyone else to eat at the table, as there is not a place to eat in the tiny kitchen. So people who want to use both rooms as bedrooms should just be aware that they may be eating some of their breakfasts standing up, or at the little vanity in the main bedroom, if someone else is still sleeping in the living/dining room.
One pleasant surprise is that the amenities listed for the apartment just say there is a washing machine, and a previous reviewer noted using the drying rack to dry clothes after washing. However, just FYI, it's a combination washer-dryer machine, so you can do both. We were able to Google some English language instructions on YouTube with a little video about how to use that model of washer/dryer.
We enjoyed staying here, overall. There is a lift to the apartment, which was nice after lugging our suitcases up multiple flights of stairs in other places we have stayed! This apartment would be perfect for one person, or a couple who slept in the same bed.