sadjst

Hello! First post on the forum but I have followed Linus for the past 4-5 years.
 
I have troubles getting internet signal in the whole house.
So, here's the story: 
green dot: where the isp cables come in the house red dots: where powerlines are installed teal dots: where I need to have wifi yellow dot: where I need to have cabled connection orange dot: where I already have cabled connection  
I wanted to run a cable from the green dot to the yellow one, on the rooftop, for the last two years and now is kinda the time to do it, nothing complicated here, but I need to have wifi where the teal dots are.
My father fell in love with the ease of use of powerlines, which are great, if your electrical system isn't 60 years old, also they have a tendency to die on us on a regular basis, which is a pain in the ass and a regular expense.
How can I cover the teal-dotted areas with good wifi signal (or the whole house)? 
I thought of running cables and installing access points throughout the whole house, but is there a less expensive/better overall solution?
 
Thank you in advance.
 
ps: yeah, raping a cad-generated planimetry with my MS Paint skills makes me cringe too.
 
edit: the house is about 300 square meters (end to end, including the terraces) if this can help.