All in all, the apartment is very pretty and the location is amazing! But you have to walk many stairs to get there (or take the lift up to Sacre Coeur :) ). Montmartre is definitely my favorite place in Paris to stay. Nice restaurant, pretty cafes, many artists - but also a littel expencive.
We stayed with four persons. Two of us had a big bed which was comfy. The others slept on the couch - which was ok but not as comfy. But for 3 nights it was fine.
We really enjoyed our stay. There are just a few things that could be improved:
One towel for each of us is not enough. It would be nice to have at least one extra towel for drying you hands in the bathroom. And a second one for showering.
Also, the rinse of the toilet took a really long time to fill up again after using it. Maybe that can be fixed.
Lastly, the bed sheets weren´t super super clean.
But all in all we give 4 stars, because Guitho is very kind and helpful and it was a beautiful stay with a beautiful sourrounding!