I've been to this one. Called the Swiss Cottage Thai Massage and Spa. On the main drag on Finchley Road opposite the McDonalds.
Changing area, lockers, sauna, steam, showers all downstairs in the basement. You get your loin cloth on, hang out in the sauna, and when you're ready you saunter up the steps, through the reception area and into one if the massage cubicles with saloon doors. I think that bit about walking through reception is really cack. Didn't even give me sandals. The woman in reception said that a lot of regulars brought their own flip flops with them....fckin hell....can you believe that? "Oh darling, where are you going with your flip flops tucked in your inside pocket?"...."just going for a pint love"
The massage was ok. Short, fat, middle aged Thai woman.was ok. Asked her about extras...."No way" was her response. I think that's why the saloon doors are there, to stop all that tease and tossing.
This place is also ok for a legit massage but no extras though.
