You will love this place for 3 reasons. One, it's amazing architecture with so much details. Two, you can walk and reach the top of the church and take incredible pics of the city. Three, is really cheap, those 3 dollars you spend are totally worth it.
You can't leave Quito with out going to La Basilica, this Church is one of the most beautiful of the city and is really cheap. Also if you love architecture or street photography, this place is going to be your "muse".
If you want to visit Quito's Downtown, this definitely should be your first stop. Because is at the beginning of the downtown street.