The host and the guardien who helped when the host isn't here don't speak English so it'd be difficult if you don't speak French (I'm self-learning French, still a beginner, that I read & write better than I speak or listen.
1. Check-in
So on the first day when I had to phone the guardien cuz I couldn't find the key in the key locker, I struggled to squeeze the French words out from my mouth. He spoke ordinary French so it's too fast for me to understand but luckily he undertood what I was talking about and he came to open the doors for me. My spoken French is so broken that he gave up and used the google translator on his iPhone when we talked in person. Actually it's that I was late for little while and also I've spent so much time looking for the key locker- I have never used any key lockers so I expected it to be something with a keyboard on it while the real thing looks so different that I didn't know it's the locker and I missed it. I kept looking around, wandering between two building entrances because they both share the same entry password that with the password given by the host I could enter both so I was so confused not knowing which entrance it should be. I''ve spent a lot of time trying to find the key lock and when I finally found it, the key was already taken away by the guardian.) Here I do have to apologize for being late.
2. The appartment itself
Actually it's smaller than I expected. The window of the living room/bedroom is facing the Sacre Coeur (along with all the neighbouring flats surronding a courtyard which I think is very interesting) while the balcony is at the back of the bathroom facing the other side. To be honest, the appartment is a little bit dirty and dusty with some ants living walking on the ground - I am an animal person so I'm ok with that. The good things of the apprtment is, it's well equipped that you can cook, watch local TV channels and iron your clothes (I couldn't find any ironing boards so I ironed my clothes in the air -_-). Also I suppose it is a very ordinary kind of Parisian appartments with stairs and lifts, views of all your neigbour windows & balconies that while having privacy in your own flat, you can hear your neighbours nextdoor, smell what they're cooking that everyone's so close together and ever chat with your neighbour across the building. I love this, it's so interesting that I think this is a proper experience of daily Parisan life. If you are looking for such experiences on your trip too, you will like staying in this flat.
Overall, I think this appartment is quite lovely. It's just that a little bit more cleaning has to be done.