...

(2) SWIP/RWHOIS + ARIN/RIPE

SWIP'ing is a bit exotic though some ISPs provide it. Be sure to use a PO box in the contact info rather than your real address if you obtain this.

This would be for privacy reasons, right? i.e. to avoid advertising my own address?

yes

What if I put there my university address? (I am a PhD there and we can receive mail. . .

Sure, that would work perfectly.

...

Looked at Aruba offerings, check this out

https://serverdedicati.aruba.it/server-dedicati/basic-1-3.aspx

Thanks very much for the advice. I will start with the small VPS one, see how Aruba behaves in terms of handling complaints and abuse reports and if all goes well I will consider the option above.

If you do, try to find out exactly what CPU it will have and whether you can choose if more than one type exists; check them against this list:

https://en.wikipedia.org/wiki/List_of_Intel_Atom_microprocessors

Several newer Atom CPUs have AES-NI instruction support. With AES-NI a 1.6 GHz will "punch above its weight" as a Tor relay. AES supports increases performance for Tor relays by about 2.5 times clock-cycle-for-clock-cycle.

Thank you for taking the time of looking into it.

Your are welcome, good luck!