This is a very well-priced apartment, in a great location for the City, whether for business or tourism purposes. One the plus side:
1. Location - brilliant
2. Helen is a great host - really good communication
3. Very reasonably-priced
On the minus side:
1. There is rumbling form the Tube or mainline, which is annoying early and late
2. The office block opposite is very close and they look right into the apartment - though this is only an issue in office hours
Despite the above, I recommend Helen and her apartment.