Posted: 15/01/2017 at 18:03
Hi Paolo and welcome!
There are plenty of fruit trees which can be grown in pots and so would be suitable for your balcony. If you search for 'patio fruit trees' you should find lots of suppliers, some on Amazon who may deliver to Paris.
Many, many types of vegetables can be grown in containers, bags, boxes or pots. Again, the keyword (at least for english web sites) is 'patio', so google for 'patio vegetable seeds' to find suppliers. Lots of folk on here grow vegetables in containers and I'm sure can help further.