Helen was wonderful: prompt in responding to emails in advance, and friendly and very helpful. Her place is quite small - the space between the bed and the clothes closet is particularly tight, and in general it's not easy to find space for one's things - but it's charming, clean, nicely appointed, and very well located. You get a real feel for an interesting neighborhood - Bloomsbury - are within walking distance (running distance, if that matters) of Regent's Park, and can get just about anywhere else in London by way of the King's Cross tube station. Helen warned us about some noise from the street - and if you're there in the summer you'll want the windows open at night - but we didn't hear much: the place was actually quite quiet.