If you're looking for a portable solution, get the Jesla. It's a Tesla UMC converted to J1772. While I didn't purchase a converted one (I did the conversion myself), I do use it for all my mobile charging needs. For the first few months of ownership, I used it as my only charging solution. You can get an outdoor RV NEMA 14-50 outlet placed outside your rental, and just plug in with this. Then, when you leave, you only have to leave the outlet. As an added bonus, you can get the adapters for all the different kinds of outlets that are already ubiquitous because of Tesla owners. It is kind of expensive ($999), but it has proved to be invaluable. It allows me to charge at friend's and family's houses with all different kinds of outlets. I have adapters for 14-50, 14-30, L14-30, 6-50, 6-30, L6-30, 6-20, 6-15, 5-20, 5-15, TT-30, 10-50, 10-30, and Marine Shoreline 50. This covers pretty much any outlet I've seen in the wild.
http://shop.quickchargepower.com/JESLA-is-THE-40-amp-J1772-portable-charging-solution-JESLA.htm
http://www.homedepot.com/p/GE-50-Amp-Temporary-RV-Power-Outlet-U054P/100193650?N=5yc1vZc33aZ1z11wfr