I have used Paramount to rent my property portfolio since 1998. Throughout this changing period I have always had great service from Paramount and sound advice. They have a very strong, stable lettings team who give first class personable service and their administrative back up is good too. Paramount have an excellent website and anyone looking to rent property in NW6 is almost certainly going to come across several Paramount listed properties. I have no hesitation in recommending them for both landlords and tenants alike.
Although I have less personal experience, their sales side seems very good too.