But definitely not this one below. There's nothing "quick" or even sort-of-nice about taking the bus to/from Bath Road.
Lest the OP should be concerned given lack of experience of Bath Road hotels, I'll balance this by saying that many, many people manage perfectly happily with the TfL buses. From Harlington Corner, at the very end of the free ride zone, I'd be very surprised if it's ever taken me more than 10 minutes to reach the Central Bus Station, more usually much closer to 5 - so I am particularly struggling with the "not quick" assertion.
If you have a lot of luggage then I'll accept that will make life a little more challenging to find space on the bus, but the trip is so short it can hardly be considered a major ordeal which you'd never want to repeat.
If you really want comfort, a taxi will get you there for a tenner.