I spent a week in Angela's studio, and as I was there to discover London I went to the city center everyday. It takes about an hour to reach Piccadilly circus, for exemple, which I didn't find annoying at all in the morning. In the night however, it was a bit of a hassle to have to take so much time to get back (this was probably worse for me as I was travelling solo and no feeling super confortable walking alone in the night). This being said, the location also has the advantage of offering a quiet atmosphere, which is enjoyable after long days spent in the bustle of the city center.
Concerning the studio itself, I would like to point out its cleanliness, the modernity of the bathroom, and the elegance of its decoration. Angela and Sacha were attentive hosts, and communication was easy. The fact that they had thought of providing breakfast for the first morning, as well as a ventilator (it was surprisingly hot in England when I was there), was very much appreciated.
I would definitely recommend the studio, for travelers who do not mind "losing" a bit of time on their way to the city center, and those who care about tranquility.