We really enjoyed the stay at Martin's place. It is roomy and especially practical if you have some people in the group that need to work, because you have a desk in every bedroom.
Only the communication with the agency that Martin is letting handle his airbnb business was a bit tedious. We asked for options for early check-in, late check-out options or if we could leave the luggage in the apartment for a couple of hours after check-out. We had to ask multiple times and on the last question I just never received an answer. We also asked if we would have access to the postbox to have our mandatory covid tests sent to the address. The agency couldn't answer the question within 3 days until it was too late for that. So if you have any questions regarding your booking, start asking them very early on.