Make yourself an outdoor gazebo/eating area with removable fly screen windows, or you could go quick and dirty with a E17 basic pergola, [E135/280 for a nice one] at Pla, Generalitat 15/23, flyscreen is very cheap, the end result, bliss.

I got sick of being attacked by Mosca Negra as I watered my garden in the evening, but discovered they do not like plants sprayed with Neem oil extract, it  also puts off caterpillars and other pesky insects.