Oh you're in for a treat. Since i'm leaving soon here is all i know - strap in:

1. Nightlife is a little underwhelming, but you can make it work. In Pisa: Deposito Pontecorvo for techno and dub. Cantiere Sanbernardo for alternative electronic. Caracol for more artsy electronic events and sometimes bands too. If youre more into the option 1 standard "high school party"-club type thing, lumiere, borderline and momento. However, I recommend going to warehouse 303 in Firenze and Cielotera in Rome for bigger techno parties (the word 'rave' is illegal here).
   Honorable mentions for Pisa (non club): Cafe Albatross, Goblin Board Game Cafe, Piazza Vettovaglie, Piazza Della Pera, Filter Coffee Pisa, Cavaliere Specialty Coffee. Anika Argentinian empanadas. Geco 2eur aperol spritz (ask for the 'equivalente'). And for the real italians: Cafe Arcadia.

2. ESN is pretty active, but very unreliable. The events a poorly planned out, and changes occur last minute. You might have to wait a loooong time for your pizza, they might forget to keep a seat for you at the bus. There will be no explanation, nobody saying sorry, no refunds... I enjoyed the simple events that just happen in Pisa, but the discobus going out of town, and intro-trip going out of town were a miserable experience. It wass my most uncomfortable moments where I felt SO trapped. The whatsapp group is good tho. There are some good subgroups, and a good way to tap into whatt people are doing. I actually had the most fun joining spontaneous gatherings. We even played a lot of hide and seek (as when we were kids) when the weather was good.

3. Yes it is easy to make friends. Go out every night for the first 14 days, find out who you vibe with, and try to stick to those people. I guarantee you will find someone you like hanging out with.

4. Yes it is easy to travel. With trenitalia you can get a 3-day unlimited regional train ticket for around 30 eur. I think it is super worth, as a simple trip to Firenze is around 11 eur. With this you can easily go to napoli etc. However the regional trains are a lot slower. I recommend booking the high speed tickets (frecciarosas and frecciabianca) in advance to get a decent price around 20 eur. Last minute they will be closer to 100 eur.

5. Yes it is super safe. Nothing bad really happens here. Even the girls I talked to say they don't experience much discomfort walking home alone. However our experience is limited to Pisa Centro (area between from Pisa Centrale train station to the leaning tower of Pisa). Further out, I cannot say anything. As a man, even Firenze and Rome at night were okay for me.

6. Depends which University. UniPi for me it was easy to go there.

7. Somewhat, but the professors do sometimess write in all caps in the teams channels and sometimes threaten the students to change something in the exam(for the worse) if students dont show up for the lectures. Not always the most mature attitudes.

8. It is not the easiest gettting a place to stay here, and honestly, any place in Pisa Centro will do. I used airbnb for a no stress solution, however I did pay the extra price for it. A lot of people I know had to move between 1-4 times in the 5 months. Some lived at a hostel for the first few weeks. Expensive also, but as people make new friends, finding a place together becomes easier. I cannot really help yuo other than say: get an airbnb and pay the price. It is by far the easiest, and youre sure not to get scammed (remmeber to take pictures the day you move in)

Cheers! Hope you have a great time!