Thanks Paddy for excelent reply.
FOr sure I should take you recommendations in consideration when to choose the hotel. I'm always in transit in Bangkok when going to other places like Phuket,Samui,Hua Hin. Coz Bangkok is a big city with high level of pollution

and to reach somewhere else within Bangkok area we waste lot of time

.We always stay in DMA oz near the expressway.
Do youhave more opinions?
Thanks in advance
Isabella