Harm's place is a must stay! It's in a good location, walking distance to most touristy things but also close to bus stops. We arrived super late due to missing our flight and Harm was more than kind, in fact he was concerned that our day was going to be bad. Harm is such a lovely person. The flat itself has the comfiest big bed and there's huge windows that open out to a lively street (the noise is blocked as soon as you shut the windows). Harm had a welcome package with so much info available and was available for any questions.
There was a kitchen (fridge, stove) available to use too. Overall, I highly recommend Harm's flat!