I'd be more concerned (with zero knowledge of washington) over whether or not the train + connections would take me near most of the tech jobs.
I've had an hour-long walking and train commute for the last year, and by the end was extremely burnt out. Moved to a smaller and more expensive place in the city with a 15 minute bike ride and couldn't be happier.
Can be, but often aren't. The trains in the three busiest commuter rail lines are not really conducive to laptop use if you are my height (6'4") because of the seat pitch. I have tried to use my XPS 13 on NJTransit trains, but I need to hope I get a row to myself so I can slant sideways to actually get my laptop at a usable angle.