Be clear that you won't be staying in the apartment that's listed on the page, it will be one of a selection in the building. Unfortunately the one I was in was pretty run down and tired but it did the job as somewhere to stay local to where I needed to be.
There are amenities supplied, but it's very basic so if you intend to be making meals you will need all supplies. The cooking basics in the listing include pots and pans but no towel for drying and no cooking basics such as oil/salt/pepper.
The description says that the classic studios overlook Golden Square but doesn't mention the studios that overlook the loud extraction fans at the back.
Check in is very straight forward, instructions are supplied and easy to follow.
The apartment was fine, but for the money I wouldn't stay again.