Omar is such a gracious host. No doubt you will enjoy your time.
The apartment is lovingly adorned in a Parisian aesthetic - appropriate for Washington, DC, a town planned after French cities. Omar is also accommodating, and you will find his apartment clean, tidy, comfortable, and stocked with plenty of amenities.
The neighborhood is among the best in the DC (I used to live in this area for a time). The apartment sits on the border of Kalorama, an affluent, picturesque neighborhood and Adam Morgan, which is bustling with bars and coffee shops along 18th Street. In a sense, the place has the best of both worlds. It is quiet and residential, although very accessible in terms of transit and proximity to restaurants and nightlife.
Omar also owns a popular establishment directly across the street from the apartment (you should go to eat during your stay, though he will not oblige you to do so). He isn't intrusive or overly attentive. In fact, he vanishes throughout the day and night to run the restaurant, but is readily available if you need anything at all.
Overall, this was one of the more comfortable stays I've enjoyed in any city.