I live near downtown SS, and I take Piney Branch to 13th St to Colorado to the bike lane on 14th St. This works great, although you still need to get from Forest Glen to 14th St. It’s a nice ride. Be careful once you hit Columbia Heights as there is lots of traffic, lots of delivery trucks, and lots of pedestrians, none of whom seem to notice the very well marked bike lane. (That said, there are some really obnoxious bikers who fly through red lights and piss off everyone else with good reason).