Teresa's apartment was great. It is located in a very quiet and safe district. It was very comfortable, clean and modern. It is exactly as the photos show. The kitchen is a lovely large area with all the mod-cons. The sofa folds out into a huge double bed. There is a large walk-in closet. The laundry room is great addition and we could easily wash our clothes and dry them very quickly - they are awesome machines! Even though we never got a chance to use it, there is a decking area with barbecue facilities outside the house and we were able to park our rental car in the drive way.
In terms of location, it is a very short walk to the cathedral (the second biggest in America!) and a bit of a longer walk (25 minutes) to the nearest metro station and about a 10 minute walk to the nearest grocery store (you can also drive there and park in the free undergound parking lot).
Overall - awesome stay. We love DC and would love to visit again and spend longer touring around. Teresa and Reid were great hosts and very friendly and welcoming and we would recommend their apartment to anyone visiting the DC area.