PArking metre is broken, even if parking for the evening. Get a $75 parking ticket if you try using it. Most expensive parking spot I've ever used 0/10 would not recommend.
On-street parking is prohibited in excess of three (3) hours between 7 a.m. and 7 p.m., seven days a week unless otherwise posted. Parking is prohibited within 300 metres of previous parking space within one (1) hour.
It is prohibited to park a vehicle on a highway or road between 1:00 a.m. and 7:00 a.m. from November 15 to April 1. However, if you have an on-street parking permit, your vehicle is exempt from winter overnight parking restrictions.
Source: http:// http://ottawa.ca/en/residents/transportation-and-parking/parking