DO NOT STAY.
Black mold, dirty, contact representatives do not follow through with their assurances, appears to be only flat on the ground floor with businesses that open to the ground floor courtyard where employees simply smoke all day which creates an issue if one wants to open the windows to get some airflow, tenants on the upper floors blast TV and music until well after midnight (again an issue if one wants to open windows for airflow).
I would not consider staying at any property managed by "Pick a Flat".