Confirm your reservation!!!!
We have booked and PAID a Superior Suite with sofa bed two months in advanced. We got the instant confirmation through our travel agency (not an online provider, but the traditional agency). As we were travelling from another US city, we arrived at late afternoon quite tired, waiting to have a shower in our room. What was our surprise when we were told they were overbooked. We were told that they have had problems with online reservations with Expedia and booking.com, which of course, were not our travel providers. 
However, as an “extraordinary measure”, they have arranged a hotel for us in the nearby (4 kilometres away) for the first night. They would pay for the room, breakfast and the taxis from the Suites to the other hotel. Although the hotel was of the same category, there was only one queen bed on the room. We required a two bed room but they told us that there were no free two-bed rooms. As we did not want to share the bed, we got a supplementary bed on the floor (80cmx160cm). I got some pictures if someone wants to have a look.
We asked about the manager and we were told he had left before (it was 19:30 p.m.) and it was not possible to find him on the handy. Thus, we asked for the Deputy Manager and we were told there was none. We also asked for the corresponding book to make a complaint and we also got a no as an answer. The night staff was very rude and unpolite, and we were treated very badly. We did not get even a “sorry”.
Things changed when we went back to the hotel next morning, where the staff was much more comprehensive and apologized for the inconvenience. Our room was quite large, including iron facilities, air conditioning, kitchenette with microwave, fridge, dishes and even washing tolos. Quality is good for the price. As other reviews mention, the key value of the hotel is location, as it is walking distance to the Capitol and the Congress Library. Underground is also very easy to access and you can even walk to Union Station.
Breakfast room is quite small and there are “traffic jams” at rush hours, so it is quite difficult to find a table. Breakfast is very plain and there is not much to choose (coffee, tea, some muffins, bagels, water melon, yogurt and boiled eggs). The second day we found some sultanas’ bread, but we did not see it any more.
From what we saw during our stay (the business centre is a very old PC near reception), there were overbooking problems nearly all the days of our stay. Visitors booked only for one night were always refused and no alternative solution was provided to them. They were always told that they had had problems with Expedia or booking.com. However, if this were truth, we wonder why they did not provide a certification saying so to visitors so that they could claim for the money to those online portals. This was very strange for us.