If you travel by car, talk to Riza and inform him so he can organise a parking spot; You will be leaving and sharing the same apartment with him, except the time he is at work.
Riza is a kind host and gives good information, ask him if you have any questions regarding public transportation or good places to visit.
Don't be spontaneous in Amsterdam, organise your trip so you can visit as many places as you can, otherwise you will end up very tired at the end of the day without accomplishments.