Stayed at the LM earlier this year. Definitely a nice hotel. Got a Suite upgrade (though I think I used SNAs for that) and the Lounge is definitely very very good (we had breakfast and afternoon drinks there).
The Pool area is not particularly nice to hang out though.
If you decide to stay there and are looking for a restaurant in the area: we liked Quan Bui.
https://foursquare.com/v/qu%C3%A1n-b...8ecc57fe062388