What is the easiest way to get to the city from don mueang?

Hi, 

Travelling alone and I’ve been stationed in Bangkok. Until I have a proper place near my workplace, I’ll be staying at this hotel named Moji Doji Don Mueang Hotel. I had a few questions regarding transport.

Whats the most reliable way to get to the city?

Is there a train station that I can use? And if so, does it stop running at a certain time?

Any tips or help would be appreciated thanks :)