You'll feel at home in Alexia's flat. She and her roommates are wonderful people.
You'll be in middle of Monmartre, with many charming shops and restaurants around.
Paris center is short walk and few metro stations away. And if/when City will get you down and exhausted You'll return to your room, and momentarily forget about all negative things and enjoy your stay.

I wholeheartedly recommend staying at Alexia's.