You also need about half hour from the time you get off the train at the Genova Piazza Principe station to the time you are at the airport (taxi or shuttle bus)
1.5 hours prior to departure is however still sufficient for a flight from GOA.
If you look for a flight from Pisa to Paris ORY, be aware that you will need to change trains at La Spezia. Not necessarily longer than going to Genoa, since there are some faster trains from La Spezia to Pisa, however a change is required.
Pisa has more flights than Genoa.
From Orly to the hotel I would take a taxi, especially with substantial luggage. The cost is high (50-60 euro) but convenient. You could also take the OrlyVal train to the metro, then the Metro to Les Halles, and then a RER train to Gare de Lyon but you have to make changes.