If you are looking for great place to stay, John's house is the best solution. Me and my husband, spend couple of days with this beautiful house. Interior is one big american lifestyle experience and it's great. John made sure that we had everything we needed. He welcomed us with bottle of wine, wich was very nice. He had great, positive attitude towards guests, he had no problem with us using stuff in the kitchen or watching tv in the living room. Whole place was very clean and with really nice touch of american spirit - flags were everywhere and it was awesome.
John also provides all sorts of guides for bus lines, metro and many more. For me personally the best part of the house was our bed, it was amazingly comfortable. When we met John, he was very kind and positive person, we chat sometimes and it was always a lot of fun.
The place is located close to the National Mall, it takes around half of an hour to get to the Capitol by foot. Feel free to use the taxi or uber, it's really cheap. There is local store 300 meters from John's house, there is also great Mexican place around the corner, where we ate one of the best buritos ever.
We recommend John's place to all of you, if you want to stay in Washington for couple of days, John is your man:)