but there are hundreds of nice hotels in Bangkok. One could easily move away from any trouble spots and find perfectly wonderful accommodations.
I would be more worried about visiting places in the far south where the random bombings keep happening as they have been for a very long time.
I was in Bangkok a couple of years ago when the airport was closed and it was the nicest weather in Bangkok (late Nov, early Dec). Very moderate temps and low humidity. This year I have shifted my trip to mid-Nov to mid-Dec to get some of that nice weather again. But it is still the tropics after all.