Joanna's apartment worked well for us on our family trip to DC. It's small but well-appointed. We found it equally convenient to drive downtown and to take transit - we were especially grateful for the SMART cards to borrow while we were there! We always have to buy transit cards in new cities, and then we don't know what to do with them afterwards, so it was nice to have them around and feel like we were passing along any leftover fare to the next guests.
The bedroom is VERY dark. This was not a problem for us, but it was a bit of a surprise and I thought other folks might want to know.
Joanna was a lovely, communicative host, and we enjoyed our stay!