We have just returned from a weekend in Roch's lovely appt. Comfortable, cosy with everything you need, including a metro stop and supermarket two minutes walk from your front door. Also a brilliant shower, wifi and lots of plug sockets (always important!) The Sacre Coeur is a 20 minute walk, and the Champs Elysee only a 20 minute metro ride with no changes.
It is next to the railway but this didn't disturb us at all.
Roch was a brilliant host, welcoming us with hugs and a bottle of wine, as well as easy directions prior to arrival and lots of recommendations when we were there.
Would love to return.