PeoplesPoker.it is probably the least-played of the major Italian regulated sites — traffic runs lighter than on PokerStars.it, iPoker.it, or 888.it.
What makes it stand out is the table format: everything here runs 4-handed instead of 6-max. That's a bigger deal than it sounds — when a weak player sits down, you're splitting them with at most two other regulars instead of five, which is a huge swing in win rate compared to the same fish on a 6-max table.
One thing worth knowing about every Italian-licensed site: tables cap your buy-in at €1,000, and there's no topping up mid-hand or mid-session. If you sit down at NL1000 with €1,000 and lose €500, you can't rebuy back to €1,000 — the only way to reset is to leave the table and sit back down. It gets mildly annoying at NL500–NL1000, where you can end up stuck playing a short stack against a weak player, or lose the whole €1,000 and have to scramble to leave and re-sit before another regular grabs your seat. It cuts both ways, though — sometimes you're the one taking a seat a regular just lost €1,000 from.