Last time I used Adelphi in Soi 8 close to Suk. About 3 minutes walking to Nana BST... that is if you don't stop during the walk to visit Lolita's or Aviva massage. If you cross Suk road (use Nana BST) you are close to the Beer Garden.
Also short walk from Adelphi to Nana E.P. and if you want to go Soi Cowboy it is the next BST station.
There is a "South American" restaurant in the hotel, food not bad. Small pool on the roof (nobody was there).
I took the biggest (most expensive) room at 3499 Baht. Had small kitchen (with washing machine), living room with 34" LCD and stereo/DVD player, bedroom with 32" LCD player, nice bathroom with sepparate bath and shower. Free internet in (executive suites) rooms.
Bangkok Serviced Apartments-Hotel Thailand Bangkok Special price hotel: Adelphi Suites