Zoé's place is the perfect base for exploring Paris - the flat is relatively small, but has everything you need for a good night's sleep and a quick meal (and also a desk if you need/want to do some work). It is perfectly located at less than 1km from Montmartre/ Sacré-Cœur and Gare du Nord, but still very quiet. Zoé met me for check-in, and communication was easy and prompt. Only thing to keep in mind if you're arriving with a lot of luggage is that the flat is on the 2nd floor and the stairs are relatively steep - pretty standard for Paris though and I managed to get my relatively large suitcase both up and down said stairs.
Would highly recommend Zoé's place and would pick it again for my next stay in Paris!