I had the very same problem in Cambridge when I moved in (despite the house having been empty for a month, the fleas were obviously surviving on something else before my blood) - pretty much all wooden floors, with carpet on the stairs and landing only.

The solution in my case was to call the council, who sent someone round who de-flea'ed the place. I'm fairly sure the stuff they were using wasn't particularly nice to breathe (I went out) but it did the job and they would come round again for free if the first treatment didn't work (it did). ISTR it was 50 quid or so.

I didn't have any problems with my clothes (though I did wash everything after the treatment). My futon was pretty close to the floor - as is their wont - and I didn't have any problems there either.

Hugo