We traveled 5 adults. 2 couples and my mother in-law (80 years old). Took 2 apartments, Superior Apartment 100m2, Standard Apartment.
Both apartments are spacious, clean and with most of the needed facilities. Washing/Drying machine, coffee machine (we had 4 capsules but the other apartment had non).
The office is in the building and available from 10:00 to 13:00, Monday to Friday. Very helpful.
Location is good too, near the U6 metro, 43 and 44 Trams, and just few stops from a major transportation hub (schottentor U). Quite neighborhood, nice places to drink and eat. This is the 80%.
The apartments are missing the last 20% - small things like a hook for a towel in the toilet in the large apartment. Also no soap to wash hands. No cleaning liquid in the toilet.
No place to put the soap and shower gel in the shower. You need to bend down and put them on the floor. Not a fun drill in the shower.
We had 4 days of high temp (32-35 deg C) - fans or ceiling fans could be a good idea (no chance for A/C).
As the heat rose Mosquito army was all over us - would be nice to have some basic repellent.
Apartments near the elevator suffer from noise - due to poor acoustics.
Note: some apartments are half-way between the floors. So you must use the stairs to get there.
Overall it was a good stay but as said many times before - God is in the details.