The Check-in process was being handled by Iambnb and worked out fine without any inconvenience. After we climbed the steep stairs in the building we arrived in the apartment on the 4th floor. Inside everything was just like in the pictures and overall a very nice and cosy place to stay. There were three big windows of which just one could be opened but there was a note saying that we shouldn't. Since the window wasn't shut properly we had to sleep with earplugs every night to withstand the noise coming from the city and the bar across the street.
The bathroom was very nice and modern but the shower kinda lacked the water pressure.
The location was great for there were many things within walking distance and that included public transport as well. Great spot to start exploring Amsterdam from. I would definitely stay at Kate's again, but hopefully with a working window next time ;)