The apartment that I ended up in is in a fantastic location and is a good size for a single traveller or a couple.
One quibble is that two weeks after my booking was confirmed (about a month before my arrival), Sak informed me that the listed apartment had already been booked. He offered an alternative apartment (https://abnb.me/9mjCfTlnKM) in the same building at a lower price, which I accepted. The alternative apartment was slightly smaller (according to Sak) and on the ground floor, but otherwise was quite nice.
Overall, despite the double-booking, I enjoyed my stay at Sak’s apartment.