If you have a car and don't mind being out of the centre, keep in mind that it's just a 20-25 minute drive from Coventry or Redditch, where you'll be able to find much cheaper accommodation (through booking.com, laterooms.com or something similar). I once stayed at the Stag at Redhill, which is about a 10 minute drive from Stratford - I think it was £50 for a room.However, my favourite website for accommodation is Airbnb.com. If you don't know it, it's a website where anybody can rent out their private room, flat, house, whatever they've got. You can narrow your search depending on whether you want a whole flat to yourself or you're happy using a bedroom in someone's house. There are some places in Stratford on here for around £35 a night.