Stayed overnight while connecting at CDG. Our plane landed at 22h30 - and we walked to get the hotel shuttle. Waited for the shuttle 40 minutes. We mentioned it to the driver when the shuttle arrived, and the driver just responded: "this is normal". The hotel is actually quite far for terminal 2... there are many other hotels that are closer. Upon check-in, my colleague was informed he did not have a king size room, although this is what he booked and he is a Hyatt platinum member. The agent at check-in told him, in a quite arrogant tone, that there is nothing he could do, there was no king size room... but after arguing... and switching room three times... they magically found a king size room. For my part, my room was ok... but nothing exceptional. Small room - with a small twin bed... I experienced better with Mercure!
The following day... waited again over 30 minutes for the shuttle to bring me back to the airport... I was the only passenger, but the driver still did not bother to bring me to Terminal 2E where my fligght departing and left me at the train station. (We passed just by Terminal 2E on the way to the train station - but the driver said "this is not where I stop").
So... overall they do not seem to care a lot about service at this hotel. If you are connecting at CDG - better pay a premium for the Sheraton... it is directly inside the terminal and the service is way way better.

Stayed here only night. The room was clean, comfortable and quiet. The front desk staff were also very good. They gave us some good tips regarding visiting Paris. They also let us check in pretty early - was which a great bonus.

This is ideal if you want to stay near the airport. They have a shuttle that will take you to the airport and also pick you up from the airport. Takes about 10-15 minutes. It's their own shuttle bus. Some of the airport hotels have a shared larger bus - but the Hyatt has it's own. The only issue with the shuttle bus is getting picked up from the airport. It seems to run about every 20-30 minutes - so you may have to wait a little while. They have a set schedule when leaving the hotel to the airport - so this is fairly easy.

If you want to visit Paris it is a little ways away - but very easy to get to becuase you can take the shuttle bus to the airport and take the Metro from the airport directly into Paris. The ride takes about 30-40 minutes. It's pretty easy and a good way to get into the city. If you are spending several days in Paris I would recommend staying closer to the city.

This hotel has given me mixed feelings. As it is a Hyatt Regency hotel, the expectations were quite high, yet the hotel fails to deliver on a few important points. First the good news: the Front Desk staff is very nice and tries to be helpful. Yet even they got it wrong.
Some of the minus points:
-My company booked me a clubroom with a king size bed and access to the club lounge. As my wife accompanied me on this trip, I stressed the request for a king size bed during check-in and was assured the room would have the desired bed accompanied by the extra facilities. When I opened the door there were two single beds and the room wasn’t on the club floor. This was corrected with apologies but did cost me an extra trip to the front desk.
-None of the rooms have opening windows. The air-conditioning was insufficient to cool the rooms, so it became outright uncomfortable. Simply much too warm! After a visit by the technicians some relief in the way of cool air could be felt, but sleeping was only possible without the duvet.
-The absolute worst point of this hotel is the quality of the food. We ate in the central lobby restaurant the first night. The buffet actually looks good, but the taste was flat and watery. Really poor quality across the board from the salads to the main course to the desert; Never again will I eat there! (Breakfast is also very bad according to my colleagues; an all out Asian affair due to the large number of Asian Air Crews in the Hotel)
-The position of the hotel is rather isolated. They do have a shuttle bus to the city (Avenue de l’Opera) that departs at 10 AM and returns at 6 PM. There is no nearby convenient store of Super Marché. The noise from the airport in negligible however; Result of good sound isolation, hence the non-opening windows. I will urge my companies’ logistics people to switch to the Marriott, which is in the village of Roissy, but still close to the airport.

The hotel is less than 10 minutes away from CDG Airport. Having obtained the Crew Rate, I would say this hotel is absolute value for money. The rooms were clean and noise free. The beds were comfortable for a good night of sound sleep. The buffet breakfast had a fine spread of continental and local cuisine. The fitness center was equipped with basic amenities. Wonderful indoor swimming pool is a must try. Over all an fine thumbs up for this hotel.