This apartment is basically faultless. It's in a brilliant location in Montmartre, convenient for several metro stations (Abbesses, Place De Clichy, Blanche) and buses as well as the Sacre Coeur fenicular. It's close to lots of bars and restaurants, with an excellent Italian practically next door, and near to a supermarket, a boulangerie, a fromagerie, and everything else you would need for a few days in Paris.
The apartment block is extremely secure and we felt very safe on the first floor. It's a roomy apartment with a large living area and a fully functioning kitchen with oven, fridge, hob and microwave. There is also good WiFi and a very nice shower.
Communication with Jérôme was excellent and we would certainly consider staying here again.