We loved our stay in Amsterdam and Marcel was a great host.
He greeted us when we arrived and was very friendly. We forgot to bring British to euro chargers and luckily Marcel had a spare and let us borrow it for the days we were staying which was great as we could charge our phones!
We got transport from the airport. It's easy enough as the Dutch speak good English if you get lost.
The first night we walked from the apartment to central which took about 35 minutes or so, it was nice to see bits of Amsterdam on the walk. The rest of the days we used the tram/buses which we used the chip cards. I recommend the app City Mapper as this gets you were you need to be and what transport to get.
The apartment was spacious enough for the two of us. The stairs are quite steep to get up to the apartment though that seems like most places in Amsterdam!
We loved our trip and will definitely return to Amsterdam again soon.