IMPORTANT: The entrance to this apartment is in an alley, via a caged door, next to some trash dumpsters. The alley is well-lit. However, I would not have chosen it as a single female traveler if I had known ahead of time. I am from DC and know the neighborhood well; fortunately, I have friends who live a block away who were able to walk me back to the apartment at night.
As for the space, it is nice enough, but I would not refer to it as luxury. This could be a good choice for two people traveling together; I think it's too small for more than two (unless you have small children). The location is fabulous. Nicole and her staff were extremely responsive to my communications during my five-day stay.