This place is a great little place to make your DC home base when visiting. It is near grocery store, great food, and pretty much any retail spots you need.
The nearest metrorail stop is about a 14 minute walk with Union Station itself only being about 25 minutes walk. There is a bus stop right around the corner which is convient. I honestly just walked most days. DC is a super walkable city, and this place was easily within that walking distance.