My experience with Colm: Excellent. I was confirmed to go to Las Vegas for a work conference rather last minute, which meant all the decent hotels on the strip were super upmarked (e.g. $800+/night for 3 star hotels). I resorted to Airbnb, which was definitely a great idea as Colm came to the rescue! I originally responded to his 2 bedroom villa posting (since that was priced much cheaper than $800/night), and he was super quick to respond and worked with me to reserve a room at the Marriott Grand Chateau. The rooms were selling out quickly and I ended up in a studio at the Marriott Grand Chateau for a very great price! So if you don't need a ton of space and want to save on money, maybe see if Colm can get you a studio there.
***************
My review of the Marriott Grand Chateau STUDIO (which has nothing to do with Colm): Very good. I would definitely stay here again and recommend to others. Great location and walkable to many places on the strip like Paris, Aria, Cosmopolitan, Bellagio. Liked that there was no casino & no smoking. Staff was super friendly. Gym is 24 hours and 5-star quality. 2 outdoor pools and 3 outdoor hot tubs. The only reason I do not rate this hotel excellent is because I felt I've stayed in nicer rooms by Marriott Vacation Club - this review is also based off of staying in the studio and perhaps this property has other nicer-appointed rooms. If you are looking for a glitzy, recently-updated 5-star quality room, this hotel will not do that. I would rate the room more on the 3-4 star level. That being said - I was not looking for 5-star and did not need that. Just setting expectations for anyone curious about this hotel.