From one owner to another.
Glad to hear that Citizen got you a replacement bike for the one that was stolen. I found their customer service folks to be top notch, helpful, and forgiving.
Having the bike (well, I'm on my first replacement after the first one's hinge broke... see other post) I can urge to to stay on top of the hinges. Tighten them when needed, but do NOT over tighten since the screws are made of soft metal. 1/8th of a turn at a time will do. Also, you may want to replace your rear tube with the most puncture resistant one you can get, as getting the rear wheel back in place, with the kickstand, and making sure the wheel isn't off axis with the chain can be really cumbersome and frustrating. Mind you, that's my Arizona experience, since parts and prickers of prickly pear and cholla cactus in the roadway is pretty common.
Don't put too much of your body weight into the handlebars, or the hinge will start to bend, making it so they wobble even under a tightened locking mechanism. Watch for rust in the joints (even in Arizona, the steel frame started to rust in the joint areas.) To keep the seat post from slipping as you ride, add some tape with a good rough texture, like gaffers tape (same with the handlebar post) around the post itself, then put the plastic sleeve over the thing. And with all folding bikes with a derailleur, just make sure nothing bumps it, and that your cables don't get caught when unfolding. My biggest frustration with the folding of the bike, is the tendency for the pedals to spin back and get caught up with the handlebar. Get a bungee cord to keep the bike closed (and for the occasional item on the back rack)
But, if you treat the bike well, keep up with maintenance (prepare for weekly), and don't abuse the bike, hopefully it will last longer than my two Citizen Miami's did for me. I now have a Dahon Boardwalk S1, and so far so good. And by the way, other than I use a bus instead of train, I have a very similar commute. Good luck!