I had a pleasant stay at Chapter Kings Cross for 2 weeks in August 2021. The studio apartment I was given was clean, quiet, and the temperature was cool although for the most part I avoided using the kitchenette to heat things up in order to ensure a cool temperature was maintained.
There are receptionists/security on site 24/7, which gives a nice feeling of security.
Unlike a hotel, they give you your privacy and don't clean your room which I prefer. Also unlike a hotel, there is a nice laundry room to use a washer/dryer, although it is a little expensive to use.
They have nice facilities- I used their gym and the snooker table.
The location is incredible; on the doorstep of Kings Cross station.
One minor negative point- the Welcome pack they gave me had an out-of-date long-life milk sachet in it.