Had a decent stay here, felt like a slightly nicer Novotel but not close to 5 stars. For the rate I paid (£170, pre-paid) it was better than what I expected though.

Booked a Deluxe room and checked in early (around noon), and the friendly front desk did their best to find an available room.
Also received a voucher for 2 welcome drinks (Gold member) - we were able to choose any drink from the bar (cocktails, wines, even champagne - except for some of the extremely expensive drinks), thought this was quite generous.
Gym is good and has a nice view, also has a decent sauna (closes at 11pm, gym is 24/7).
Temperature in the room was fine, but even though it was August it wasn't too hot during my stay so that helped. As my room overlooked the busy road, there were some city noises throughout the night: no problem for me, but light sleepers might wake up from ambulances etc.
Room was mostly comfortable. Pillows felt a little synthetic to me, and the desk chair was very flimsy, felt as if I would fall over. Otherwise a good stay, close to St Pancras (which was why I stayed here). Would stay again for the right price.