Decent Value But You Get What Your Pay For...
I stayed at the Days Inn Connecticut Ave for one night on Jan 21st. I had chosen the property based on reviews I read on trip advisor and the fact that the hotel was such a great value in price. Let me preface this review by saying I prefer to stay in properties that are 3 stars or above and this property never claimed to be as such. 
The good news is the price for the hotel is a GREAT value for Washington, DC. I am a local who grew up in the area and live in Baltimore, and I can assure you that you cannot find a better deal than this for a hotel in DC. This is also the nicest Days Inn property I have ever seen and the staff is charming and accomodating. The property is also located in a nice area with convienent metro access, which I would say is a must for any DC visitor!
Now for the not-so-good news. Although this is the "nicest" Days Inn property I have ever been in, it's still a Day's Inn. That being said, there are no frills to be found here. There is no free breakfast, you have to pay for parking (a norm in DC), and the rooms and property are truly just OK, by my standards. The first room that I was assigned had ripped sheets and odd stains on the comforter. I promptly requested a new room. The second room was better and the staff even allowed me to pick between a few rooms if I wanted because the hotel was at low capacity, which I thought was quite accomodating of them. The rooms are basic and a bit dated, adorned with old school floral bedding, drab carpeting, basic drapery and furniture etc. The buidling is old and the elevators leave much to be desired with some sort of faux concrete decorum on the walls that just appears dirty and industrial (in an unpleasant way). The hallways are dark and maze-esque with a musk odor. I could go on but you get the point. 
If you are doing DC on a budget then this may be the right choice. But I must admit for a little more and probably trying your luck with something like Priceline's "Name Your Own Price" function you can probably find a more comfortable property to enjoy your DC experience.