We did not get to meet Max or Billie in person, but communication was always very easy and fast. We arrived quite late (due to a late flight) and it was nevertheless easy to retrieve the keys and access the studio. During our stay, Billie responded very fast and efficiently when we had a problem, which we appreciated. The studio itself is very clean, with all necessary equipment.
The only downside - which is beyond the control of the owners - is that the studio is adjacent to the building's water boiler unit, which is quite loud. This makes the apartment quite noisy at times.