The lady who works there (I think she's the owner) is very good! I had an exfoliation and massage for £25 which is very cheap but I also thought the treatment was excellent. As others noted the street is very audible but it didn't stop me relaxing in any way.
From the outside, it does not look like it's even open. When I entered there was no one there to greet me, but then a lady came out of one of the rooms and asked me to take a seat. I waited for 10 minutes without seeing a soul, and then the lady came out and sat down without speaking a word to me. I had to ask her when I would receive my treatment and it was already 3 mins late, and she just said when she finished with her other client...although she was just sat at the desk?? When she actually did my treatment she was efficient and clearly experienced, but I'm not sure I would go back.