We had a great stay in Fin's appartement. The location is a little bit off the tourists areas, but very accessible via public transport, very close to Montmartre and there is everything one needs (boulangeries, cafés, groceries). This neighbourhood is what Paris is really like: cosmopolitan, diverse and urban.
The appartement is very comfortable and nicely decorated. There's a good coffee machine, comfortable beds and a neat little balcony to have your morning coffee while looking at the rooftops.
Check in was seamless and we felt very welcome.
Your stay also comes with a free workout with 6 stories of stairs (no elevator)! really it sounds worse than it is.
This is a great place and we would go back anytime.