So I'm not very good at writing reviews but I gave this place 5 stars. Two big positives I want to mention:
--) Very responsive and helpful hosts! I cannot stress this enough. They gave me tips on my first day about how to get to where I wanted to go. When I needed to print some documents, I was able to use the hotel printer without any charges.
--) Amazing location, particularly if you want to explore the 18th arrondissement. It's about a 15 minute walk from Sacre Couer and about a 10 minute walk from the very pretty Lamarck Caulaincourt area. This part of Paris has an amazing amount of character, the narrow streets, the pretty cafes and shops, the many stairways together create a wonderful environment. If you've already seen the touristic parts of Paris (the Eiffel Tower, the Notre Dame area etc), I think you'll really enjoy staying here. (FYI, there are tons of grocery stores and bakeries close to the hotel too in case you need them)
And just for the sake of balance I'm also going to mention a partial negative :D
--) The sink in the room was really tiny. I'm not exaggerating when I say that every time I splashed some water on my face, half of it would end up on the floor. It's funny the first few times but it get's annoying after a while. Still, it's not the end of the world!
All in all, I'd strongly recommend this place to anyone travelling alone, looking to be out into the city for most of the day, and perhaps wanting to explore the 18th. The hosts are very nice people and super helpful, which is always great! I'd definitely stay here again!