Unfortunately, we stayed here twice, about a month apart. Both times the pool was quite cold (not sure if that's normal or not, but the staff at the pool area made mention to us about how cold it was, so assume it isn't normally) and also the hot tub was out of action both times. Sauna and Steam Room didn't seem to get very hot, either.
Other than that, which was part of the main reason we booked the accommodation, it was pretty good.
Rooms were nice, nice restaurant and bar area with reasonable prices, easy access to / from Heathrow Airport on public buses. Staff were all super friendly! Would happily stay again, but be nice if the pool area facilities were all operating properly.