Staying at Sohée's was a unique experience, even for someone who has previously lived in Paris. The apartment is nice with plenty of space in the main area. Because it is under the roof of the building, head space is limited in some parts but nothing limiting. The views from the window are great, it's well heated, and we had a very pleasant stay.
There are a bit over 100 steps to climb from the ground to the apartment, but it is not steep and we did not mind it too much.
Communication wise, there is a small local guide in the apartment with a few restaurant and bar suggestions, check-in was super easy, instructions were clear and all questions were well answered.
Overall, it was well worth the price, and a place I wish I could have stayed in longer!