Marnix' apartment was perfect for my stay! It was a lovely clean apartment with homely touches. It's just 10 mins from the city centre, and right next to the beautiful Heemraad park. There's a great little balcony off the bedroom to appreciate the sun in the evenings. I didn't have time to do much cooking while I was here, but if you did there's nice big space to make food with all the appliances you'd need.
Marnix himself is a great host who was easy to get in touch with when I had a questions, and was very kindly flexible with my check out time when I was running late to leave :) When I make a return trip to Rotterdam I will definitely ask to stay here again.