I've never been to Unionville but omg it's beautiful! You can tell there's a lot of history and a lot of effort goes into maintaining the look of historical buildings. That's why this particular Starbucks in housed in a much different building than you'd normally see. It looks more like a home than a coffee shop.
Inside is lovely. It's two levels, which is awesome! The only other one I've seen with two levels was midtown toronto. Tons of comfy chairs, tables and bar stools to choose from.
The service was fast and polite and of course everything tasted on point (gotta love that quality control). They say location is everything and with a chain it takes a good location to stand out. This Starbucks does an amazing job. The whole downtown area itself is gorgeous.
The only issue (hence the 4 stars) was the parking. As with any downtown area, it's a pain.