My 3rd time staying at the Adelphi Bangkok. It’s a fantastic hotel, with very helpful and polite staff. The rooms are light, airy, clean and comfortable. With a great bed. The fitness room is quite well equipped (CV Machines, Dumbbells, and the rooftop pool is a pleasant oasis.
The hotel is well located in the heart of all the Bangkok nightlife. It has great transport links and the airport is less than an hour away (Nana Stn is a 3 mins walk from the hotel).
The hotel restaurant (Monsoon) is very nice, but a tad expensive for Bangkok. You do get 1 x 20% off for one meal.