Yes, the Mercure Hotel Düsseldorf City Center offers parking on site. The parking is available for both hotel guests and the public at a price of €25 per day. No reservation is required, making it convenient for those needing parking while staying at the hotel or for visiting the nearby areas.

The Mercure Hotel Düsseldorf City Center offers a range of room types including Privilege Suites, Standard Twin Rooms, Standard Single Rooms, Standard Double Rooms, Superior Suites, and Privilege Double Rooms. These rooms accommodate either 1 or 2 adults and do not allow smoking. Bed sizes vary from Twin beds to Queen or King-size beds. Room sizes range from 151 sqft to 560 sqft.

From the provided data, there is no specific information about leisure amenities at the Mercure Hotel Düsseldorf City Center. However, as it is an adults-only hotel, guests can enjoy a more peaceful and tranquil environment throughout their stay. This could provide a relaxing atmosphere for guests who are looking to unwind and spend quality time away from the hustle and bustle.

Additionally, the hotel's central location in Düsseldorf means that there are various recreational activities and attractions nearby. Guests can explore the city's cultural sites, shopping districts, and restaurants, allowing them to immerse themselves in the local culture and cuisine.

It is worth noting that while the data does not explicitly mention any leisure facilities or activities within the hotel, guests can make the most of their time by taking advantage of the hotel's convenient location and venture out to enjoy the city's offerings.