I'll third Me Too, too.
My only gripe with them is that they are not natural uppers, so if you wear them in hot weather your feet sweat and you can get blisters. But in Paris on the days that weren't hot (70s) I wore them all day long and walked everywhere in them. They are truly an 8 hour shoe. I took just three shoes for the trip, and I wore them the most.
They do stretch out and can seem to slip off your feet when you first put them on. However, I found that if you are walking everywhere for 8 hours, your feet swell so much, the stretching is a good thing. Also, if you are going on an airplane, feet tend to swell, so the me-too's are perfect for that.
Second favorite choice would be Cole Haan in a ballet flat. Many of their styles have Air Nike technlogy, and real leather uppers, so are more breathable.
I really like my Privo's but alas they have a back strap that doesn't work for walking a lot. But, I would definetly give Privo another try in a different style.
