Say you’re renting a room in a flat, where at some point one of the tenants is moving out. The landlord might let you choose your new flatmate, provided you find him/her yourself. Where should you advertise the room?

This question was actually asked in LandlordZone forum but we’ll ask the same question for London specifically:

Which website is best to advertise a room to let in London?

What would you recommend and why?

Here is the list of websites that we know of:
EasyRoommate.com Lots of latmates, flatshares
FlatmateClick.co.uk Good selection of flatmates & flatshares
Gumtree
Clasifieds site. Post room wanted or room available
Live Simply Listings from private landlords only
MoveFlat.co.uk Flatshares
Spareroom.co.uk Flat- & houseshares, flat- & roommates