A far away place

Edit:

As the question changed, I will now propose a more updated answer:

In the backwoods

Backwoods meaning:

an area that is far away from any towns

Otherwise, "in the middle of nowhere" will do just as fine.

Edit: Due to the OP's desire, I would like to add an additional option, which although not idiomatic English, could be used to describe a far away place as well:

A mile and a day/Peter's place is a mile and a day away!

If you want to imply a populated area instead of a more rural setting, you could use clear across town. I would drop the word "really" to make your example:

I saw a nice house for rent but it's not good for me: it's clear across town.