I've stayed at Hotel Arts several times and highly recommend rooms/suites on the Club Level. Yes, they are more expensive however the level of services and that personalized feeling you gain from their Club Lounge is well worth the cost, in my honest opinion, not to mention the amazing views!
The rooms are spacious, as other reviewers have indicated here, and very well appointed. The hotel's restaurants are top-notch and have an excellent selection of food and wines.
This hotel is exceptional! I highly recommend staying there!