How to forward WAN via Wi-Fi to the center of the apartment?

Question

WiFi

A twisted pair cable from the provider comes into the apartment. There is no desire to drag it through the whole apartment. The provider gives the Internet on l2tp.
You need to get a router with a gigabit network in the center of the apartment between your computer, NAS, printer, and whatever else the devil wants. NAS, the printer should be available to everyone (including via Wi-Fi), regardless of whether the computer is turned on. And provide class n Wi-Fi throughout the apartment.
Is it possible to forward a link from the provider to the router over the radio channel so that the l2tp connection is raised by the router and for it this radio channel is just a "wireless piece of twisted pair".
All that has come to mind so far is two nanostation m2 and an ordinary home router. But it seems superfluous to me to raise a narrowly focused radio channel in an apartment for the sake of 10-15 meters. Are there any other solutions?
From the equipment there is Asus RT-N16, Asus Wl-500g and the budget "up to 10 thousand". The task is to squeeze the maximum inside the apartment and pump honest 30-40 Mbps of the provider.

Answer 1

For myself, I chose the option with Powerline . There is a connection from the right-winger to the corridor, in the center of the apartment there is a router + us. I download all 50Mbit from the provider ..

Answer 2

The simplest solution is two access points. One transmits a signal from the provider's wire (sorry for the stupid phrase), the second receives and sends to the router. Oh, and a cumbersome solution turns out. Is there no way to organize all this at the entrance to the apartment (for example, in the closet)?