If you’re far enough up Georgia that someone is branding an Airbnb as being in 16th st heights, you’re really in brightwood. There is not a metro stop within reasonable walking distance, but there are busses. I personally would exercise a bit of extra caution in that area at night, but there’s really no reason for you to be walking to anything but a bus because there’s nothing up that way (better to Uber at night in that area anyhow). Overall you should be fine but it isn’t the best area (Georgia ave).