Here is the solution to the treasure hunt! Don't peek if you're still playing... 😉

The first one was pretty easy. The first link puts you right in the middle of the square and just walking around on Google Maps and looking at the shop fronts revealed Siena as the answer.

Off to Siena then, to a familiar sight - I visited the Duomo years ago. A quick image search for its interior resulted in this detail matching the description in the second riddle.

For the third one I admit I just started searching for toy stores near the location given. Though there was only one that had "toy hospital" written on the entrance... 😊

The next one I thought was a little tricky. I kept looking for a "roundabout" in or around the park, until I found out that "giostre" also translates to "rides"... ta-daa!

The place with finger food was found after a nice virtual stroll along the harbor... 😊

And then for the final riddle. I found myself dropped in a small Italian village, right here:

Zooming out of the map I was in a place called "Settime", which means "seventh" in Italian. There were also seven wheels in the village's coat of arms. Seven, however, was not the word Paolo was looking for. 🤔

Until I looked at the name a bit closer - of course! Settime is an anagram of Steemit! Hurray, I had found the answer! 🤗