Hi Jan,
You are right, there are no rates posted in his website.
I think the transfer to the airport was around 50 Euros and to the port around 130 Euros? I thought I still had the e-mails from Bob but I don't, sorry! I remember sending him an e-mail and getting the info on rates right away.
I hope you can arrange to stay for the 3 nights. That'll make a big difference in what you'll be able to cover. If you stay for a 3rd night( even if you only stay for 2 nights!) try to go to the Borghese Gallery . Amazing sculptures! Reservations are required.