I'd go the other way out of Siam to Rachatewi. Tons of housing options and I can walk to BTS in 4 minutes and airport train in 8 minutes. Walk to Paragon 12 minutes , Central World 15 min. Coffee shops all over and many , many restaurants 5-10 min walk and local area with much cheaper options West of station and tons of new ( and older ) buildings East. I find Phaya Thai BTS area to have less options of everything however compared to Rachatewi.