Think twice.
We stayed here for four nights in April just when this hotel was being taken over by Kimpton Hotels. The hotel is about 15 mins walk from the White House and not far from all the sights. There is a small lobby with some interesting seating and free wifi is available there. There is happy hour with free drinks every evening. 
Rooms (we had two) are spacious with plenty of hanging and drawer space in both rooms. The bathrooms had shower areas at one end. It is quite difficult to keep the water from staying inside the cubicle as there are silly, short shower curtains (in a modern 4star hotel?), our shower head kept falling off it's holder as it was broken. The beds were all as hard as boards. The curtains were just not quite wide enough to keep the light from the street lights at Thompson Circle from illuminating the rooms all night long. Serious irritation,this when all you want is a good bed, some darkness and a good shower (which, to be fair, you get from the water pressure). 
This doesn't stop here. Both our rooms were not made up after our first night but as we came back quite late we told them not to bother that night. Strange, as staff had been in to change all signs, umbrellas, bathrobes to Kimpton Hotels. Second night, our children had no bath towels. As we had an early flight, my husband went down to check out and order a large taxi for four adults and a lot of luggage. There was an empty reception desk with the night receptionist wandering in after 5 mins. We were seriously let down by the car valets and were in danger of missing flights when the wrong (small) car turned up, a larger taxi arrived by was turned away by the valets as it was not his 'friend'. We had to wait for this 'friend' and then renegotiate the price we had already agreed. We left on a very sour note. 
As I write, we have just (hopefully) sorted out their accounts department. We had prepaid, but our card was charged again, twice for one room and once for the other. These amounts seemed to be credited and debited with astonishing regularity.
Kimpton is a great chain and could easily, and quite simply, make a few changes at Donovan House and bring it up to it's other hotels standards.