We just left Bangkok and while we were there, we went to Lavana Spa almost everyday! They have a website: http://lavanabangkok.com/about_us.php. We stayed at the Marriott Courtyard, but this is also very close to JW Marriott and Mayfair Executive Suites. You take the train to Asoke station and walk towards the Nana station. Keep your eyes up, as you'll see a sign for "Condoms and Cabbages" and "Lavanna" spa - to turn left down a small street. If you have a massage before 11am, they feed you a lovely breakfast of eggs, bacon, salad, coffee and toast and marmalade! All for 450 baht for an hour of thai massage or 550 for 90 minutes. I asked for #29 each time as I thought she did a fantastic job. We did not try any other treatments other than thai massage, but the place had a lot of upscale thais there - clearly a local place, not just for tourists.