Foxtons have been amazing namely Sophia Rawlings.
From the moment we entered the store in Chiswick to the moment we found a place to live, we had nothing but enthusiasm and help. Unlike other lettings agents, Foxtons listened fully to what we wanted. They were very open so you felt you could be completely honest in your feedback to them when viewing which ultimately led to finding the right place to live.
I would highly recommend using Foxtons as they have changed the experience of finding a property. I actually became excited to view places rather than feeling it was a chore.
Use Foxtons, and if you can, ask for Sophia ;-)