Hi Carly and
I see from your other posts that you are planning to keep Mow's babies, and have Mow spayed when she's finished feeding them. A very good idea.
I also see you have some concerns about fleas. The kittens are too young at the moment for flea treatment, so they need to be seen by your vet to make sure they're not suffering. The vet can treat the whole family for you and you can rest easy the kittens and Mum will be happier and healthier (and you won't be bitten).
As for the house, I use Indorex household flea spray (buy direct from VetUK on line or your vet) which breaks the lifecycle of any fleas already resident in your home, and one treatment lasts up to 12 months. I just checked the can and you need to remove the animals from the bedding before treating the fabrics and furnishings and ventilate the room before putting the cats back. I suggest you treat the room before taking them the the vet so the spray will have worked and cleared before you get back (it's toxic to fish and birds, so take extra care if you have other animals around).
Have a look in the Purrs "Health and Behaviour" section, there are topics covering everything you need to know from fleas and worms to feeding and vaccinations, but we're especially hot on neutering
Good luck and enjoy your kittens, do come back with some photos, we'd love to see your tiny family.