Arlington has a good balance of vacant apartments that should make it possible to find a place in any month of the year. Don't try to rush the apartment hunt though, as the relatively high prices may mean that some apartments are out of your budget. To find a quality place in budget, give yourself about 8 weeks to find an apartment.
Applying for an apartment in Arlington is a little tricky because of how expensive the apartments are. Landlords aren't going to rent to you without some sort of assurance that you can afford the place. Sometimes, this might take the form of a credit check, and in other instances you may need to offer up some sort of confirmation of employment.
Arlington is very easy to survive in without a car, especially because it is connected to the Washington D.C. subway system. The 3 subway lines make it easy to get around Arlington, and into the core of D.C. at any time. There are also busses that cover most of the area, operated by the Arlington Transit Buses or ART system.
Visiting the variety of monuments, historic buildings, and government facilities that are open to public tours can keep you busy for months in Arlington and the greater D.C. area. The Fashion Center is a large shopping center that is accessible from the Pentagon City transit stop. Although great restaurants and bars can be found throughout the city, to find a wide selection within a small, walkable neighborhood, head to Clarendon.