This is a pretty average hotel all the way around. It is clean and the rooms are fairly comfortable. You want to stay here if it's important to be in walking distance to the Capitol and the mall.
The Sunday brunch is a bit pricey but it's not easy to find a place to eat in the neighborhood on a Sunday morning.
One design issue that is a problem for people with luggage is that the front door leads you to a down escalator. Everyone seems to struggle getting their bags up and down the escalator to the check in desk, elevators, etc. You have to wonder who thought it was a good idea to design the front lobby that way.

the neighborhood is bad, there's no minibar in the rooms. WIFI service is very expensive. The staff , however, is very nice and friendly

This is an excellent choice for a hotel to do business in the DC area - I stay here all the time (20+ nights per year). Easy trip in from Reagan Airport, close to the various Administration departments, walking distance to Capital Hill and the legislative offices, 2 blocks to Union Station - the location cannot be beat. The staff is friendly, the rooms are clean and sizeable. The decor in the rooms is fairly recently updated. The rooms a bit dark for getting work done but are very quiet for sleeping. Not a lot to do in the neighborhood after hours, but there are a couple of good restaurants nearby and Chinatown is a short cab ride. Overall a very good choice - and can get decent rates for DC if you book early.

I was overwhelmed by the customer service at this hotel. All the staff was incredibly friendly and helpful. The location was very central. A short walk to Union Station made this very convenient for getting around the Capitol Hill area. Surprisingly, my room was directly located across the street from the Fire Dept. I wondered if this might be a deal breaker, but was pleasantly surprised to discover that the sound proofing in this hotel is amazing. On the occasion that the FD went out on a call, you could barely hear the sirens. I would have thought the sound was coming from way across town. - I was traveling on business over the weekend, and discovered that many restaurants in the area were not open when I was free to eat. Not a reflection on the hotel, just an observation that I think might be worth noting. While there I ate at the Art and Soul across the street - Excellent food. Would also recommend the West Wing for sushi and bagels with lox (yes they have a very eclectic offering). Would have loved to try the deli across the street, but they never seemed to be open when I was free to eat.