We spent 4 days at Mark's place and it was perfect !
His flat is cosy, in a quiet street, not far away from the center and close to the main public transports.
We didn't see him but had a nice welcome by one of his friend when we arrived & a wine bottle was even waiting for us on the table.
You'll find everything you need in his place (we didnt use the kitchen but it was obviously fully equiped) and the bed is super comfortable !
There is also a nice little terrace if you wanna have breakfast in the sun.
Don't hesitate one more second, it's a really nice place to stay in Amsterdam !