Excellent place to stay. Kiran gave us all the information needed to get into the apartment very smoothly. Five of us stayed, me solo in one bedroom, my friend and his wife in the main bedroom, and their two kids on the sofas in the front room and we were all comfortable.
Location was perfect, only about a two minute walk from Great Portland Street tube station and walking distance from some good restaurants.
Only slightly negative thing I would say is that the shower is extremely small - if you are on the large side (like me) you may find it cramped, and it might be more of a problem if you have mobility issues. Just something to keep in mind. But I would definitely stay here again.