I do not know where the owner purchased this sink, but similar styles are available from many sources, including stores like Home Depot. If you search for "apron-front farmhouse sink", you should find lots of options.

try bigfrogsupply.com, i got a great one from houzer there

The wood countertop - who made that? Do you know how it is expected to wear? Or how to maintain it?

That is a great sink, I think it goes very well with the rest of the kitchen. My eye was also drawn to the countertop, the wood look is so nice and I love that look. I was wondering how do you make sure that it is flush with the wall? http://www.simplescribe.com/product/simple-scribe/ 

We have sinks like that available here on Houzz. https://www.houzz.com/products/italian-fireclay-reversible-white-single-bowl-sink-30-prvw-vr~52483790?lid=37689760