Yes, you can stay with your pet at Hotel des Nations Saint Germain. They allow pets for free and there are no extra charges. However, it is important to note that you need to make a request in advance for your pet to be allowed.

Hotel des Nations Saint Germain offers three types of rooms: Comfort Triple Room, Double Room, and Single Room. The Comfort Triple Room can accommodate up to 3 adults and 1 child, with a Twin bed and a Double bed. The Double Room can accommodate 2 adults and does not allow smoking, with a Double bed and 2 Twin beds. The Single Room is suitable for 1 adult and also does not allow smoking, with a Twin bed. All rooms range in size from 108 sqft to 161 sqft.

According to the provided data, guests at Hotel des Nations Saint Germain can spend their time enjoying the sun deck and utilizing the business center.

The sun deck is a great option for guests to relax and soak up the sun during their stay. They can lounge on the deck chairs and enjoy the beautiful weather while taking in the views.

Additionally, the hotel offers a business center for guests who may need to attend to work or other professional matters. This amenity provides a convenient space for guests to access computers, printers, and other office essentials.

Unfortunately, the data does not provide information about other leisure amenities that may be available at the hotel. Therefore, guests may need to explore and inquire at the hotel for further details about additional activities or facilities that they can enjoy during their stay.