Blue Grotto boat tour

[cairns local]

We (four adults) will be in Naples on Sun 20th Oct this year and have booked an 'Isle of Capri on your own' transfer through the Ship.  Can anybody recommend a company to use from Marina Grande for a trip to the Blue Grotto?  There seem to be many companies and many varying reviews, so I was hoping someone can share their own favourable experience.  We are thinking of doing that as early as possible and then going up to Anacapri afterwards.  

[caripoo]

We have done this on our own with our own boat.....Just be aware, due to ocean conditions, sometimes you are not able to enter the grotto, I wonder if this sometimes is why the reviews are terrible. 

[cairns local]

Thanks, caripoo.  yes, fingers crossed, I know it is a gamble.  Tides seem favourable then, but will have to wait and see. Do you need an italian boating license (is that even a thing?) to hire a boat?  DH has Australian boat license.