I had a really nice stay at Joanna's Place. The Room has quite some space available for London.
The Room is orientated to the street but with closed windows it didn't disturb me in any ways.
The house itself is very well located near the west ham station, which lets you get to the center of London very quickly and also Startford (Westfield Shopping Center, Olympic Park,..) is just one stop away.
I was traveling to work to Soho everyday without any issues.
All in all Joanna was a very nice and helpful host and I can definitely recommend a stay at her place :)