Looking for a hotel near Heathrow for night of arrival or departure? I suggest the Leonardo.
We only stayed the one night before flight our home. I anticipated a typical near-airport hotel, somewhat mediocre facility whose appeal would just be location. However I was pleasantly surprised: the Leonardo was an excellent hotel, for any location. The room was well appointed, roomy (especially the bathroom), clean, and very quiet. The staff was friendly and helpful.
There's a shared shuttle to the airport, but for just a few pounds more the hotel offers a private car. I think it was £17, a bargain compared to the £50 that Uber and limo services wanted, and much more convenient and quicker than the bus or shuttle.
There's a bar with limited food service so you don't have to leave the hotel to eat. We only had one meal there; the food was nothing special but okay.
There's no doubt that I'd stay there again whenever flying to/from Heathrow.