I love Tazza D'oro! It is in such a great little area and is a nice place to spend some time with a delicious cup of coffee.
It it sometimes busy and hard to find a table (which is not surprising since it's a great spot), but I like the neighborhood feel and the staff has always been very friendly.
I usually get iced Americanos in the summer and regular coffee or lattes in the cooler weather. All of the drinks I have ever had here have been tasty. I have also had some of the pastries (and maybe a bagel at some point?) and everything has been fresh.
I'm a big lover of coffee shops and this place fits all of my requirements. While I don't live in Highland Park, it's definitely worth an occasional trip.