Pros
IF you like Georgetown, then the location is great. You don't have to travel too far to get to Wisconsin and M St, and Glover Park actually has some good places to grab lunch on your break. The salary is quite competitive, especially for research assistants who are still in grad school. Since the economists who work there are also teaching or doing some research with Georgetown University, they're very open about helping you with your work and are willing to take the time to explain either how to calculate certain things, which software to use, or even how to set up your Excel sheet correctly if you're new.
Cons
As a person who enjoys a bit more liveliness, the office can be just a total downer. Everyone stays in their office the entire day and it's so quiet you can hear the air coming out of the vents. Not only that, but research assistants are put into a little nook in the middle of the floor with no windows, natural light, or connectivity. One of the desks just meets in the center where the walls are coming in, and if you suffer from claustrophobia you might freak out. Those who are there put their earbuds in all day and don't have much to say.