Last year we stayed at the Premier Inn, Bath Road. Good value and very well organised. Highly recommend.
You get on the HOPPA bus at the airport that goes to the hotel, they run every 15mins or so I think. We had to leave the hotel at 5am and the bus came along exactly on time. I did a lot of research for this having just flown in from Australia, not so young anymore, and wanting things to be as easy and smooth as possible for our connection to Barcelona. I don't think it could have been any better other than having a hotel right at the airport as in the Sofitel at T5.