The Castex Hotel offers a variety of room types including Triple Rooms, Double Rooms, Family Rooms (Two Connecting Double Rooms), Twin Rooms, and Single Rooms. Smoking is not allowed in any of the rooms. The occupancy ranges from 1 adult in the Single Room to 4 adults in the Family Room, with bed sizes varying from Twin beds to Double beds. Room sizes range from 129 sqft for the Single Room to 269 sqft for the Family Room.

From the provided data, it is not clear which specific leisure amenities are available at Castex Hotel. However, guests can make use of the featured amenities such as free wireless internet, a 24-hour front desk, and concierge services. These amenities provide convenience and connectivity for guests during their stay.

In addition to the featured amenities, Castex Hotel may offer other leisure facilities such as a fitness center, a swimming pool, or a spa. These amenities can present opportunities for guests to engage in physical activities, relax, and rejuvenate.

Guests can also explore the surrounding area of Castex Hotel, as it is located in the Marais district in Paris. This historic neighborhood offers various attractions, including museums, art galleries, shops, and restaurants, where guests can enjoy their time and immerse themselves in the local culture.

Overall, guests at Castex Hotel have the opportunity to utilize the hotel's featured amenities and explore the vibrant surroundings to make the most of their stay.