Need to know
49, including 21 Junior Suites, four Suites and six Prestige Suites.
12 noon, but flexible, subject to availability. Earliest check-in, 3pm.
Double rooms from $341.24 (€315), excluding tax at 10 per cent. Please note the hotel charges an additional local city tax of €2.48 per person per night on check-out.
Breakfast is extra: €29 for Continental; €36 for the buffet.
This is likely to be the only time you will use a gym with chandeliers and a parquet floor.
At the hotel
Spa, gym, library, private dining rooms, gardens, and free WiFi throughout. In rooms: flatscreen TV, iPod dock and Guerlain bath products.
Our favourite rooms
Our hearts lifted at the sight of room 204, a junior suite on the first floor. This two-level suite overlooks the grand entrance and the grounds, and has plenty of witty details, including a trompe l'oeil 'parquet' carpet and ‘library’, and a tweed armchair with elbow patches on its armrests. The bedroom feels more classically French, with its grey-and-white patterned wallpaper, although the bright red bedspread keeps things zingy. Room 303 is a calm white space with low pendant lights and a bed topped with an ornate white-and-cream bedspread.
No pool, but the spa has two steam rooms.
Decked out with gilded mirrors and plush sofas, the spa has a boudoir feel; try one of the decadent Guerlain facials, infused with orchid extract or royal jelly, in one of the two treatment rooms or steam away any tension in the hammam.
Flying goggles and headscarf: should the hot-air balloons in the grounds decide to head skywards, you’ve come prepared. Alternatively, leopard-print scarves or stilettos and sexy smalls for your grand boudoir – it’d be a shame to let Bambi Sloan’s come-hither decor go to waste.
The mansion was originally built by the widow of French prime minister, Adolphe Thiers, to provide a learning centre for some of France’s most talented students.
Dogs and cats are welcome (owners are charged €35 a night). Just let the hotel know when booking. See more pet-friendly hotels in Paris.
Little Smiths are welcome, too: baby cots are free, as are extra beds for under-11s (€55 a night for over-12s); babysitting can be arranged with 24 hours’ notice (€20 an hour).