For an apartment dweller, this might be a good jack from Harbor Frght. It can be partially disassembled easily for storage, and for it's capability and price, it's light.
For How to do most maintenance on a 986, the
Pelican Parts tech articles are great. Pelican Parts is the forum sponsor, and the articles are included in:
101 Projects for Your Porsche Boxster -A mandatory purchase if you buy a 986 from a seller that doesn't give you a copy.
Happy hunting. If you have any reservations about buying a particular car, don't be afraid to walk away. There are plenty more and a better one will come along soon.