Agree, the Renaissance is good, you can request a room with a view on third floor, but if you are prepared to pay a supplement, you can get a Club room, many of which have views, but gives access into the lounge on the third floor with good views and usually snacks and soft drinks free, alcohol at bar prices. They also do breakfast in the Club lounge if you don't get it as part of a deal. If you stay on the weekend plane spotters deal you get free parking I think, otherwise it is £10 a night.
BBC usually uses the car park for its views of LHR in the background.
I used to stay there most weeks, when Concorde left on an evening, it set all the car alarms off in the car park...