Had a lovely time here with my mum for her birthday.
The apartment is perfectly located. So close to the beautiful sights of Montmartre and to lots of good restaurants etc.
The balcony definitely has one of the best views in Paris. It's also really close to some amazing fabric shops if you're into that kind of thing (we were). There is a supermarket close to pigale metro (which I'd advise going to over the one on Rue D'Orsel).
Comfy bed etc. and lovely little dining area. Would absolutely return.