https://en.numista.com/forum/topic65438.html
I'm currently on holiday in Rome, and I asked for recommendations on coin dealers. darcymt recommended this one, which I have since visited thrice;
http://www.filatelianumismaticaroma.it/
Filatelia Numismatica Centrale is by far, and I say this without hyperbole, the best coin dealer I have ever seen.
A perfect combination of extensive inventory, excellent customer service, and good bargains/ discounts to be had! I was able to (almost) complete my 1861-1946 Italian circulating coin and 1900-1946 banknote type set there. I highly recommend them to anyone who calls themselves a numismatist (or philatelist), and the guy running the shop, Marco is courteous, friendly and most importantly, generous in his pricing.

Stuff I purchased in Rome
Again, please go patronise them if you're ever in Rome, specifically at No. 106 Via Due Macelli.
Now on to Madrid to see what awaits there.