I have mixed feelings for this stay. Its price is very competitive but because you share toilet and shower with others, I can understand why others say it is not a hotel but hostel. Normally, in other countries like UK, they will explicitly say they are hostels, unless it’s like in the mountains or something. In Paris, no, and this is not only F1 does it. I will agree that you either name yourself hostel, or spell clearly in the title of the room, like Tandem Room with Shared Toilet and Shower. People won’t feel cheated then. It’s indeed not easy to spot you have to share toilet and shower with others. I am ok though, the toilet and the shower are relatively clean. I have towels too. In fact the room size is big enough for a private shower and toilet. You can look at how hotels in Japan do - you can in fact be qualified as a true hotel. The space is there and it’s not fully utilized.
I would have given it 4 stars if the room doesn’t smell smoky or cigarette. It’s not severe, after I woke up I couldn’t smell it. It might not the hostel’s fault too. But since I can smell it, I give it 3 stars.