I stayed over at the newly opened Hyatt Regency Bangkok Sukhumvit in June. The great thing about this hotel is the location. It has direct access to NANA BTS via a linked bridge and it is also just a short walk to Asoke BTS and Terminal 21 shopping mall.
There are also some restaurants located on level 2 as well as the popular Let’s Relax Spa on level 3.
Spectrum Lounge & Bar, the sky bar located on level 29 was pretty awesome too. Nice place to hang out and the drinks are not overly expensive.