Must have gone with the 1/8 inch wall board
The number one thing I look for when staying at a hotel is a comfortable night's sleep. Even with the aid of earplugs, this did not occur for me. From the time I went to bed (12 am) until 5 am, I was kept awake by incessant door slamming and conversations from other guests. I saw skip the gym, get rid of the Starbucks in the lobby, put the concierge on unemployment and INVEST IN SOME SOUND INSULATION. While you're at it, Marriott, go to home Depot and buy some weather stripping.. install it around each door and soften the cacophonous door slams. 
The indoor pool was fine for my daughter's enjoyment -- but it was quite small. 
Room service breakfast was adequate, save the mound of "hash browns" that were cold and mushy.
Only a few of the sabe channels worked... amazing how there was 'NO SIGNAL' for both NBC and CBS.
Yes, the location is covenient... However, you'd have a more comfortable night's sleep on one of the public benches on 12th Street.