Some say this isn't as good as Midnight in Paris. I have to disagree. It's just as funny, with just as much pretty scenery, pretty young people and romantic vistas of the historical European cities envied so much by the Americans.
The plots are several: various love triangles, mistaken identity, farce: there are at least 3 unconnected story-lines here. I made the mistake of trying to connect them all up from the beginning, but they don't even follow the same time frame. It gets a bit surreal at times - just as it did in Midnight - but go with it.
The main difference to the last one is the appearance of the man (Allen)himself, typically self-deprecatingly, as Grumpy Old Man who, together with his sensible, long-suffering wife, provides much of the humour. Lots of other famous faces too - can't remember the names, but you'll have seen them elsewhere.
Another nice touch is the prevalence of Italian spoken (with subtitles!), which you don't always get in American films set elsewhere.