The best marina when visiting Genova is Marina Porto Antico at 44:24.7N 8:55.5E. It is slap bang in the middle of the Old Town, perfectly placed for sight seeing, restaurants etc. It is also right next to the best aquarium I have ever been to. Sensational. I'm advised to avoid Marina Genova Voltri as it is too close to the airport, very noisy and the aviation fuel will damage your teak decks.