I stayed at the Marly for 4 nights on a business trip, I chose the hotel because it was between the airport and the plateau and wasn't disappointed.
You definitely get more than what you pay for, it's not a luxury hotel, and it doesn't pretend to be, but it's pleasant, it's by one of the laguna, the rooms are spotless and the staff is friendly.
The WiFi was good, it supported my business VPN connection to the office in England with no issue.
They exchanged Euros with only about a 3% margin on the exchange rate.
The rooms are not luxurious but they are comfortable, a bit spartiate but very clean and everything worked.
In the morning it took me about 20mns to get to the plateau, in heavy traffic.
The only complain I had is that I asked for a shuttle from the airport via their website and never received an answer and there was no shuttle when I landed, so they can definitely improve on their communications.
Overall, very good, I will definitely book it again.