I've played this campaign on normal with bots and advanced with other people, with a custom mutation similar to Hard Eight with 100 commons limit and 8 SI limit.

It's one of my favorite Left4Dead2 campaigns, and not just because it's based in my country.
It has a lot of interesting details, like the starting church with alive NPCs, a functional pulley-counterweight to open/close the initial door, events in middle of action, a spectacular helicopter with machine guns crossing the sky just when you reach the finale run, and some scenarios of an extraordinary quality, very faithful, and with a multitude of details referring to spanish culture.

Bots have a problem when the finale run begins, right after seeing the helicopter. Sometimes they can't get out of the round fountain for a long time, which can be fatal. You have to wait for them to get out (wasting precious seconds) or use "bots warp" with Left 4 Bots right after you leave the fountain to teleport bots to your position. The rest of the way they usually follow it well.

The finale is extremely difficult, one of the most difficult I've seen in any campaign, but can be beaten if you lower the SI limit from 8 to 2 on Normal or Advanced. Expert is quite a feat, but I hardly ever play expert.

You can get the secret "Copito de Nieve" tank, which does not appear during the campaign unless you have it installed at this link:
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1805557156

If you use any mod that modifies commons, you will also need this article that I created to be able to see the soccer fans of Barcelona and Español along with any mod that modifies the commons.
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2799812593