You can take a taxi (20/22 € per car + 1 € per baggage) or T2 tramway from the airport (stop BELFIORE).
From Pisa you can take the train to Florence S. Maria Novella. There is also the Autostradale bus that leads to Piazzale Montelungo, from where you can then walk to the apartment (10min by viale Strozzi and viable Belfiore then via Cassia).
Parking not covered in Piazza S.Jacopino (10 € per day, by reservation).
Further detailed information will be provided before the arrival.