Hotel is nice but inconvenient
Let's start out with the positives: the hotel was clean, the breakfast was free and plentiful, the room was a decent size (although only moderately comfortable), there was a fridge in the room, and the staff were really nice and provided good customer service for the most part. 
Now...the negatives. This hotel isn't really near anything if you are visiting D.C. to see the attractions and it is not near a metro stop. The neighborhood seemed safe enough I suppose but you had to drive through pretty rough parts of town to get there. There are fast food and convenience stores within walking distance but I'm not sure what else because I didn't really explore the area on foot. 
The worst part of our stay was the shuttle service. We flew into Reagan National and took the metro to Union Station. We arrived at Union Station right at 6:00 p.m. and were told that the hotel offered a shuttle service from Union Station to the hotel. I called the hotel and was told where to stand and that the shuttle would be there at 6:15 but they might be a little late because it was rush hour. I told them that my husband and I would be there waiting. At 6:25 I called back and asked if we somehow missed the shuttle or if it was running really late. They made sure we were in the right spot and I told them that I saw the Days Inn and Holiday Inn shuttles so I was sure we were in the right spot but that we hadn't seen a Marriott/Fairfield shuttle. The response we got was that we were supposed to get the Holiday Inn shuttle because they were picking up for them that day. In a respectful way I complained that nobody informed us of that and the Holiday Inn driver who clearly saw us didn't ask where we were going to let us know he was also picking up for the Fairfield Inn.
The clerk was extremely apologetic and told us to take a cab and that they'd reimburse us for the expense. So there's an example of the good customer service. We got there and with tip the cab was $15. While we were waiting to check in we grabbed a water and two small bags of chips as a snack. When it was our turn at the counter we gave them the receipt and the lady gave us $15 in cash. When I went to pay for the snacks she told us not to worry and to accept them for our troubles. Again, another example of good customer service.
After we dropped off our bags and cleaned up we wanted to go back to Union Station but we were told that they only provide service to Union Station on the hour and pick-up at a quarter to the hour (although I got mixed messages on pick up times when one person told me the shuttle left at a quarter after and picked up at a quarter till). Union Station is only 15 minutes away so I'm not sure why the shuttle can't run every 15-20 minutes? I guess that's how they schedule the shuttle so we decided to take a cab back to Union Station and pay the cost out of pocket because we didn't want to wait 30 minutes to leave on the hour. Be aware that to get a cab to the hotel you have to notify the hotel when you want to be picked up and give them about 30 minutes to get a cab to the hotel . You have to make sure to plan because you can't just go out and wave down a taxi in this neighborhood.
The next day we got the shuttle to Union Station when it left at 11:00 a.m. with no problems. We met a friend for a quick lunch at Union Station but needed to go back to the hotel quickly for something. We caught the 12:15 back to the hotel and then wanted to head back to Union Station at 1:00...well, the shuttle doesn't run between 12:30 and 5:00!!! So we paid another cab to take us back to Union Station.
In my opinion, if you are going to D.C. to visit attractions this might not be the best hotel for you unless you just plan on leaving the hotel in the morning and then picking up the shuttle at the end of the day. Just don't expect to go back and forth with ease. Again, it's clean and there's good customer service but it is not iconveniently located to anything and the shuttle service is so spotty it doesn't help. If the hotel ran the shuttle service every half hour all day and it was reliable then this hotel might be worth it if you get a good price. But if you are like me and try to pack in as much as possible and are planning on using shuttle service/public transportation then this hotel will leave you frustrated because you'll either have to plan around their limited shuttle services or pay for a cab.