The apartments were fine, but definitely not amazing - if you need to stay for a short period, in this part of the city, and your budget it tight (Zurich is pricey), there aren't really a lot of other options.
In my opinion the rating when I booked (8.something out of 10) is overly generous, even for a reasonably keen price. General cleanliness was OK, but not great - common areas clearly get a lot of traffic, the bedding and towels were clean and fresh (but very cheap and/or very old) but soft furnishings in both our rooms were stained and very, very tired. Taps and showers were in desperate need of replacement, kitchen units and flooring was bashed and has seen many hard miles.
Check-in is in theory very simple (get an email ahead of time / get a lockbox code / get a key) but as we had 2 rooms on our booking it was actually a case of guess which code is working, open that room, find an un-labelled key on the coffee table, try that in the other room door - not ideal when the 2 members of staff arrive on entirely different flights.
All-in-all, acceptable and I've stayed in worse, but it wouldn't be on my list of places to book again, even considering the fairly reasonable price.