I was living in Heritage hotel at silom or i-resident also not a bad hotel which is opposite. Both are great hotel in silom area. It only take 1 min walking to the BTS(chong nosi) then interchage at siam station. Then take the BTS to ARI station. When you arrive to the ARI station you will see the adidas outlet and Fuji japanese food restaurant at ur 12 o clock. Take left hand side walk path and keep walking until you see a tall brown building (about 5 min walking) that is DR path Office locatied on 32 floor. The landmark is the Mc donald. Not tat far i think, hotel also provide excellent service plus free internet.
Otherwise my house hotel just beside Ari station. Never stay there before but it was recommended by the Dr path office girl. Not much hotel close by the clinic or you can try search at www.asiarooms.com you can actually select which area in Bkk you wan to live in.
Good luck.
regards,
handsome.