Hi you must go inside the DCA to catch the metro ride or use hotel shuttle to go to DCA forgot about walking it is hard and cars are major problem too.
Not sure, we didn't ride the metro.
About a 10 minute walk. I just did it and am standing in the station as I type this. The shuttle runs every 20 minutes.
If they have shuttles avaible they will drive you to a nearby Metro station
15 minute walk. Walk through Crystal City shopping centre to avoid crossing roads.
Another option is to take the hotel shuttle to the airport and catch the Metro at the upper level. It's a little further than the Crystal City City walk.
The Crystal city station is about two blocks from the entrance to the hotel
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