The reason most of the coffee, and tea, tastes terrible in Calis and Fethiye is that the water quality is just too hard and needs softening a bit. Doesn't matter what machine or brand of coffee you use hard water will kill it every time. There is a lot to making and keeping coffee tasting good but basically hard water gives you next to no chance.
Ozsut on the harbour Front is my favourite, also Illy is a top brand but Lavazza is Italy's number one in the home. I have found that, as with the UK, coffee is everywhere these days but good coffee is still hard to find but I love a good coffee all the same.