You can say 'high quality hotel', 'five-star hotel' (though in different parts of the world this may mean different standards), but what I hear the most is just simply 'luxurious hotel'.

You could also say a fancy, grand, palatial, magnificent, upscale, and many others. Good luck!

Extravagant - this means expensive Lavish - rich, luxurious Deluxe - similar to luxurious First-rate - best quality Sumptuous - fancy, expensive looking