Yes, can't get away from the negative of the location I'm afraid - it worked for me because I was looking to chill out by the pool mostly and I also typically rely on Grab rather than the MRT if the traffic doesn't look too bad. They definitely are aware the location is a negative and it feels like the hotel generally is trying to compensate for this in other ways (there is a half hourly shuttle service to the MRT all day as well, although this obviously restricts the times you can leave). Probably won't work so well for a first time tourist or someone who has meetings all over Bangkok whilst they are here.

Should also add caveats that i) I actually quite like the location of the W vs. Sukhumvit so probably more comfortable with this location than most and ii) I'm not sure I'd be so happy with the location if it was April and maximum humidity, but at this time of year it's completely fine in my opinion.