My two sons and I spent a week at Mafe's place while visiting all the tourist locations in DC. We really enjoyed our time there. The kitchen was well supplied, the beds were comfortable and there were plenty of towels. All of the appliances functioned well.
The location is great! It's in a quiet neighborhood with plenty of stores and great restaurants within a few blocks. The closest metro station is about a 10 min walk and there is a bus stop on the corner.
Keep in mind that there is a family living above, so you will hear the pitter patter of little feet. But it was not disturbing in the least and ceased completely before 830pm.
Overall, when compared to comparable hotels in the area, Mafe's place is a great value I highly recommend.