Shangri-La in Paris is nice, two Michelin restaurants and a bit more of an opulent feel than the Shangri-La in the Shard, which isn’t bad either to be fair, great views out over the city.
Prince Akatoki is another decent one in London, not huge but modern chic with an oriental twist. And a great Japanese afternoon tea!
Chateau de Berne in Provence is lovely, it has its own vineyard too, very relaxing place to stay out in the countryside. You’ll need a hire car to get out and about from there though. But the wines in the unique square bottles are amazing. And it has a Michelin restaurant of course, one of the best we’ve eaten in.
Reid’s Palace on Madeira is very nice too, old school but probably the nicest on the island, it’s a Belmont Hotel.
Gidleigh Park is a hidden gem (literally, it‘s down the end of a one way country lane in deepest Devon) but well worth a visit, especially the suites with balconies.
Burgh Island off the south Devon coast. All 20’s style art deco glamour and black-tie dinners surrounded by the sea. They take you across the sand in their sea tractor.