Just wanted to give people a heads up about this property - I was in Monaco for one night last week while roadtripping through the region. I stayed at this property & had an excellent time. This hotel had quite possibly the best & most knowledgeable front desk agent (Mohan) that I have ever experienced. Everyone at this hotel was friendly & professional - one of th best staff's I've ever encountered.
We got a room overlooking the Mediterranean Sea and the hotel has the new Marriott beds already - so, we got a great night's sleep. There's a free shuttle that only runs til 10PM - but it'll take you to key locations around Monte Carlo. The train from Monaco to Nice is 6.80 Euros roundtrip & a cab ride back from the casino area is only 12 Euros.
If you happen to do a stay at this hotel and you are driving yourself, don't park in the self-park, which is 1.40 Euro per hour (I don't think it's owned by the hotel - I think its public parking & the 1.40 per hour is a discounted rate), park along the side entrance road - there are limited spots, but it's completely free.
www.marriott.com/mcmcd
Editted to add:
The cost of a cab to the hotel from NCE is about 75 Euro - for 75 Euro per person, you can take a 7-minute helicopter ride from NCE to the airport & do a mini helicopter tour on the way - beautiful part of the world!