I recommend "JIMS LODGE" at 125/7 Soi Ruamrudee off Ploenchit Road, Bangkok, 10330.
Tel: 66 2 2553100 (15 lines)
Fax: 66 2 2538492
email: jimslodge@yahoo.com

Very well located in a clean, safe, quiet area for everything in BKK since it is close to the British Embassy, also Ploenchit Sky Train adjacent to Embassy, plus the Lumphini Night Bazzar is just down the road too. Near to Lumphini Park which is a really nice setting.
The food is really good too, I call in there when in BKK.
Khun Anant, the owner speaks excellant English and is a really nice man. Try for just a couple of nights.
Krisna.