Using a PC means that any community fixes that get posted to places like Dark Souls Nexus. The big three are as follows.

DSFix, which is a general fix mod that lets you set to game to a higher resolution and implement other things that From Software couldn't be arsed to fix.

DSMouseFix, which makes it so if you refuse to use a controller the use of a mouse is much more tolerable since you can even use a five-button mouse and it comes with a whole bunch of settings so you can change your play style. I like to make Guard and Attack be the left and right buttons, then hold shift to make them Parry and Heavy Attack.

And recently there was a mod that makes it so Summon Signs (how you coop) appear in the worlds of your GFWL friends much faster. So if you make a friend while randomly engaging in Jolly Cooperation and add said person to your friend list, you'll be more likely to encounter them later.

'Floppycock replied to your comment.' .... do... do I want to see what he posted?

Yes. You certainly, do