D.,
You have more friends now than you ever will in your lifetime. :) We had a HORRIBLE time about 7-8 years ago, and we only have 1 w-w carpet in the bedroom. I have several large lists of other stuff you can do, if you want to msg/mail me. I don't have them all off the top of my head, unfortunately.
DO NOT BOMB. You don't need hazardous chemicals to do this, just a bit of elbow grease and know how.
Vacuuming is certainly helping: Put a piece of flea collar in the bag. You can reuse the bag, just be sure if you empty it, do it outside. Vacuum at least 2x a day (exhausting, but then so are friends!) and put pillows (if affected) into a plastic garbage bag and seal it w/duct tape or better.
You've treated your pets, that's great. Are they indoor/outdoor? It's a little late in the season for this suggestion - nematodes - but you can check out the package directions and see how much warm weather they need to establish if you spray them on your lawn. We had them put down about 7 years ago, and this is the first year we've had a problem with bugs/slugs (but no fleas in the house yet from my active 14 yr old pup who rolls in the lawn :)
There's a lot more ,but my DS is waking and I have a million things left to pack before we leave!
Good luck,
M.