I was able to spend only a short period in Guillaume's studio due to unexpected circumstances leading to a need for renovation, in which neither me or Guillaume would have been able to anything about. However, during my short stay Guillaume was always available through messages to help in any kinds of situations, and we were able to sort out the difficult situation easily together with great communication.
Most of all, the location is nice, check-in was super easy, and the apartment itself is in very good condition having been quite recently renovated. All in all, very good apartment to spend an even longer-term (maybe less than half year) period in Paris. Only concern for me was the lack of storage space, but I managed anyhow.