From now on, this page should be your first port of call when looking to find a flatshare in West Hampstead. Tweets with the #whampflat hashtag will all appear here, so scroll through the recent ones to see if anything meets your need, or send a tweet yourself and it will appear here. I'll RT any relevant tweets that I see missing the hashtag and add it in.
If you've got a room to rent out, then you should definitely read about my tie-in with Apartli. Put your room up on its website (for free) and you could win vouchers from local businesses like The Wet Fish Cafe, or Mill Lane Bistro.
If you're looking to rent an entire flat or house in West Hampstead you'll need the West Hampstead Property for Rent page, and of course there's a Property for Sale page too in case you decide that owning your own place is a lot preferable to having a landlord.
Scroll down the page for flatshare lists from other aggregator sites
Spareroom requires you to register for free to contact advertisers. Here's the list of rooms to rent in West Hampstead (you can also search for possible flatmates, but people tend to be very flexible with their search areas, so the basic search returns an awful lot of hits).
Spareroom - rooms to rent
Good ol' Gumtree always has a fair smattering of rooms and flats to rent in West Hampstead. Here's the latest list:
Finally, Moveflat also has listings of West Hampstead flatshares, although generally far fewer than the others: