Eric is an easy-going landlord provided that you are in bed by midnight at the very latest. So if you have to work until late, make sure that you stick to this time restriction.
My three personal experiences:
1) Sometimes he asked me for the keys, so I had to ring the bell for him to open the door. This was uncomfortable for me (as I felt as he was controlling my arrival times) and also for him.
2) On one occasion I informed him that I would be out during the coming weekend, and he asked me whether he could rent my room (with my belongings in) during my absence. I did not accept this proposal.
3) One Monday I arrived home 20 min past midnight because of my work. I was not planning to cook to avoid kitchen noise, but still he came off his room and shouted at me that he was sick and tired of my late arrivals. I was in the bathroom for brushing my teeth, but he pull me out from my arm towards my room shouting "you go to bed right now and tomorrow morning you have to leave this apartment immediately". And so did I under these circumstances. My reservation was paid from 1 May to 30 June 2018, but I left on 5 June 2018. I must emphasize that I come to Rotterdam every year for 2-3 months, but never in my life had I had a problem like this!