I am a bus or Blue biker so i don't know much about scooters. i do see some folks taking a scooter on Washington St in Somerville. Not sure how far they are going.

Personal assessment: I would be concerned about pavement conditions, there's a lot of construction going on along Washington Street. Not sure how comfortable i would be on a scooter.

On Blue Bike, Washington Street, to me, is a moderately comfortable street. Not totally comfortable but generally okay with very little door zone biking.