Dear Marta in Madrid! :-)
It looks to me as thought the machine needs a good cleaning, but if you can test it and inspect it and see that the wires are all sound, that would be good. The foot pedal appears to have been re-wired and there is a converter in the photo; so, is it a North American motor? If I were you I might look instead for a FW with a European 220 motor, mainly because those converters are heavy and you will have to deal with it constantly, lug it around, etc.
For Canada, that price is not great, but I appreciate that in different regions, different prices levels apply. You are probably a better judge of that. I would consider more about what it will require to have the machine clean, running, and whether I would be happy with the heavy converter.
Good luck!
p.s. On the plus side, it does seem to have a nice little box of feet and such :-)
Last edited by Cecilia S.; 02-11-2014 at 05:09 AM.