We had a wonderful experience in Montmartre! This flat is perfect for a couple with lots of room to spread out. Stylish touches abound and there is abundant light. The kitchen is modern and functional with quality newer appliances, The toilet and bathroom are separate, which is convenient. All must-have amenities such as dishwasher, combined washer/dryer, and electric conductive range are included and easy to use. The bedroom has a northeast exposure and the main rooms southwest so can see the city below, including the Eiffel tower. This arrangement plus the elevation on Montmartre provides for lovely breezes in the Summer (when we were there).
The flat is about a 10m walk to Place du Tertre (the square), Sacre Coeur (must see!) and surrounds and slightly longer to the Metro (Abbesses, line 12) and there is a separate funicular to help with access up and down Square Louis-Michel (the hill in front of the church). Line 4 is also close at Château Rouge. My wife and I love walking so this was an ideal arrangement. In my opinion this is the perfect location from which to experience Paris. You can readily access any neighborhood but then have a nice hilltop retreat at the end of the day. Montmartre itself has many attractions including those for the gourmet, artistic or religious traveler.
A few specific recommendations: the Montmartre museum and the medieval church of St. Peter. For happy hour we visited Autour du Moulin on many occasions (Rue Lepic and Rue Tholoze) and for quality dining we recommend Poulbot, the Mailbox, and Le Bon, Le Butte. The former is near the square and the latter two on upper Rue Lepic itself, one right below your bedroom.
A final word, like all cities, pick pockets targeting travelers are active in Paris so please be vigilant, especially in crowds and anytime you are tired or disoriented. Follow common sense such as distributing cash, cards, and phones among your party and on yourself and leave your passports in your room.