Frode,

IFR or VFR?

Le Bourget will be a very expensive option, it is for big iron GA.
Toussous Le Noble is behind Paris from where you are most likely
coming, but it is the easiest to get into IFR. Also, the STAR starts
somewhere over Luxembourg and leads you directly across downtown Paris.
Turn to final is over Versailles. Metro access to Paris is decent.

There is one small GA field on the east side of Paris, too. The name
escapes me right now, but it, too, has Metro access.

--
Thomas Borchert (EDDH)