I stayed at the Dynasty Grand Hotel in Sukhumvit for 2 nights. First impression was good with a pool, gym and a games room to use too. The hotel rooms were good but some of the balconies were quite small. I used the gym which was big and roomy for a hotel one, the problem was that I drank water from a water cooler in the gym was a big suspicious, the A/C wasn’t running so this water was definitely was contaminated. I got waterborne food illnesses because of that dodgy water cooler, not the street food. When in Thailand always drink sealed bottle water, many gyms in Thailand don’t use water coolers because of problems like this. Anyway if you like stay at a hotel close to the nightlife in Sukhumvit, this hotel would be great for you, I know there’s some rumors you can drink the tap water in Bangkok, don’t risk it, drink bottled water and you will be fine.