Hi Lilla,
I have a rowing machine (Concept2 Series D) and a Total Gym (replica of one, anyway). I just got a cheapie rubberband weight set for targeting stuff too, since the Total Gym is better for "big" lifting (presses, squats, etc), but not so much for targeting the little guys like rotator cuffs and high-rep lifting.
They both breakdown nicely to take up not too much room, and I can get the rower ready (or not) in under 30 seconds, the TG take a little longer, but not by much.
Good luck!