In reply to arch the parch:
How much are you looking to spend, and is the centre of town essential? The place I stay in for 4 months in winter is in Les Pelerins, about five minutes past the hospital (which can be very handy!). I would guess it would be about 1200€ a month, is very well equipped, and can accommodate a couple of visitors if necessary. On the bus route to town. I can check with René the owner if you are interested.