[5] Located in Wallenberg Place, near Park Lane and Oxford Street, this hotel has 153 rooms, a grand ballroom (which can hold between 50 and 550 people), a club lounge, an all-day lounge, a champagne bar and a luxury spa (The Spa at the Montcalm), which comprises a fitness center, a sauna, a steam room, a Jacuzzi and an exercise pool.

The interior design of the restaurant and its Sky Bar, produced by Tonik Associates, takes inspiration from the building's architecture, using traditional materials like brass, timber, bianco marble and leather.

The hotel contains a gourmet gastropub (The Jugged Hare), a restaurant (Chiswell Street Dining Rooms) and business conference facilities.

Occupying a Grade II listed building opposite its sister hotel (The Montcalm at The Brewery), London City Suites shares the amenities of the latter site.

At the end of October 2015, a mobile app for iOS and Android was launched to allow visitors to plan and book their stay at the hotels, manage their reservations and get updates on latest deals.

[10] In August 2014, the Montcalm London Marble Arch trained its staff to use the Google Glass to enable them to offer advice on local restaurants, shops, travel plans and directions, freeing them from being behind a desk as they do so.