Unfortunately, we were disappointed with our stay at Martin's place.
The biggest issue was the uncomfortable bed. It was a double bed and it was really hard and full of springs (akin to the kind of mattress you have on a pullout sofa in the U.S.) The pillows were totally flat and the sheets were worn-out.
We stayed nine days, and I was also a bit surprised that the apartment wasn't better provisioned. We only got two bath towels and one hand towel (no extra towels, no pool towels - I noticed a prior guest also mentioned this to them) and a half roll of toilet paper.
That said, there were good things about the apartment. It was spacious, with lots of room to put away your stuff, the location in Palermo is great, and it's relatively quiet with a nice balcony.
There was not an option to check-in early, or even to drop off our bags.