My destination is 19th & K though I typically hop off it at Key Bridge and go through Georgetown (M to Pennsylvania) and Washington Circle. I might try 21st to H St returning though, as I hate my return commute part through the city (I usually go via K St underneath the Whitehurst, and then climb up around to Key Br). My only concern is that the Roosevelt Bridge bike lane always seems very narrow, the times I’ve driven by it.