This was a fantastic place for my purposes, which was conference at the convention center. It's also only a five minute walk to the L Street and Mount Vernon Metro station. The hosts are a wonderful young couple, very helpful, friendly and flexible. It is a basement place and there also is quite a bit of foot and street traffic outside, so might not be the place if you're looking for total quiet, but I found it peaceful and definitely quiet enough for me. It is as advertised, quite cute and convenient. Basically and efficiency apartment with a queen sized bed. The four steps can be a bit tricky, so probably not for someone with walking difficulties.
I'll plan on staying there again next year for the conference. Loved the place and thoroughly enjoyed the hosts!