Hotel website:

http://www.marriott.com/hotels/trave...ph-collection/

Category 8.

"The Hotel Círculo Gran Vía and the history of Madrid is revealed through the main rooms of this palace, the former home of the capital city’s Merchants and Industrialists' Circle. Inaugurated in 1924 and partly renovated in 2017 to be turned into an adult only hotel is a reference because of its excellent location, the perfect accommodation for discovering the city’s main attractions, being only a few metres away from the Plaza Mayor, the Puerta del Sol, the Royal Palace and it's only 17 km away from Madrid’s Adolfo Suárez Airport.

With 71 fully equipped rooms combining tradition and design, a Fitness room, meeting rooms, free Wi-Fi and unique spaces such is its spectacular terrace, guests will find everything necessary for a memorable stay, for both business and leisure travellers. Relive the history of the city and its main artery through the Hotel Círculo Gran Vía."

Adults Only
"Only guests of 18 years of age or older, and those persons who comply with all the legal and administrative requirements to access the Casino operated in the Building, and that are not registered in the general access to the Game Registration Register (RGIAJ), will be able to stay in the Hotel."

Property has 46 rooms & 25 suites. Casino onsite (hence the adult only part).