Piling on with the Brompton love here. Apartment friendly. Car trunk friendly. Motorcycle sidecar friendly. Their hardcase makes it airplane friendly. Theft-resistant, since it's carried and stored next to you more often than most bikes. The Brompton luggage system (its mount and low, forward position) is amazing. Bags can be massive and carry a lot of weight and the bike still feels great to ride. For pedals, I use…
I have two Bromptons (a 3 and a 6 speed). Unfortunately, I've also had TWO stolen .. painful. This was years ago now and both were locked up in central London. The second time, locked via a "Kryptonite New York Fahgettaboudit", a good U-lock. An angle-grinder gets through these easily and they're battery powered. I don't believe ANY bike lock is safe now and never lock the Brompton up outside. Great bikes!