I'll put in my two cents on a pair of comfortable shoes that I think I'll be using as a primary shoe for a multi week Italian tour in September.
I've been searching for reviews of comfortable walking shoes that don't look too dorky or scream "garish American tourist" and came across several rave reviews for the allbirds Wool Runners. Several of the reviews hyped them as THE most comfortable shoes ever and that you could even wear them sockless. After researching the company I decided to try a pair. I've had them since Saturday, and I am impressed. I've got narrow feet - AA - and am kind of hard to fit, but so far, so good. Right out of the box I put them on - sockless - and took the dogs out for a reasonably vigorous walk. No chafing, no rubbing, no blisters. Plus, they look far less dorky than many walkers. They aren't neon, they aren't emblazoned with brand logos, and to this relatively fashion challenged schlub, I think they compare favorably on style points. These might even be the shoes that I wear to a performance of La Traviata at La Fenice in Venice. I might even approach a certain level of bella figura while wearing these.
I have absolutely no connection to allbirds, in fact, I never had even heard of the company until about 2 weeks ago, but I'm thrilled to have another option for comfortable shoes. I'll keep the Travel Forum updated as I continue to test drive them. I've got a 12 day trip to Ottawa coming up and plan to take them as my primary shoe and see how they do.