Wearing a different pair of Keens (golden Mary Jane) traveling though France, I met someone else wearing the Presidio.  I loved the styling - in between a sneaker and a hiking shoe - and needed some myself.  Bought the red and am absolutely loving them, perfect for long walks and my sensitive feet never hurt.

Fit: a previous commenter mentioned having narrow heels but a wider toe box, and my feet are shaped the same.  Keens in general are great for my feet!

Sizing: several people mentioned going up 1/2 size but I disagree.  I usually wear either a 9 or 9.5 (always for running shoes) and I'm a 9.5 in Keens.  So not up 1/2 size but *maybe* the higher of 2 sizes you usually wear?  The roomy toe box can sometimes make them feel a little big but it's more about getting used to how shoes should actually fit.