The Annex was a good place to stay. Its a stylish and modern space with plenty of places to park along the road and a 10-15 minute walk from Ickenham Underground station.
Our only issues were that there were a few hairs in the bed (very clean other than that), the curtains don't reach the top of the windows which meant the room was quite bright as soon as the sun rose and that the room was uncomfortably hot.
It was 26 degrees inside so made for an difficult night's sleep. The fan provided helped, but it was still just moving round warm air. It wasn't particularly hot when we stayed either, about 22-23 degrees in the day. A small air conditioning unit would help.