GOOD: This is a great location - less than 15 mins walk from the train station and less than 10 mins walk to the bus station that takes you directly to the airport in 15 mins. Check-in was easy. Bed is comfortable.
BAD: I'm a light sleeper so this may not apply to you if you are not fussy with the sleep conditions. I find the curtains too thin, and the traffic noise is pretty constant (there are other rooms in the house, I suspect you can request for a quieter room). But also, the walls are quite thin, so you could hear sounds from the other rooms on the same floor and the floor below.
If you are an easy sleeper and want a room in a good location to catch a flight in Heathrow, then I would recommend this place.