I've had Portlandia in my front yard, in Portland Oregon, for at least 8 years now. It grows tall with the help of a littlesupport and blooms abundantly with minimal black spot.
I find it doesn't like hot sun. The blooms are always best during cooler cloudy days. I don't think the heat bothers it as much as sun does, but the colors immediately fade if they get much sun. I'm allowing some shade to grow around it via camellias & a paperbark maple and it has been helping.

It took a year to take off. But the blooms are spectacular!

It grew to about 6 feet in the first year with many beautiful blooms. They start out dark orange red and fade through a coppery color to a soft pink. I can't even describe it really, but this is an amazing rose.

I planted this rose last year towards the end of summer. Angel face didn’t make it but Portlandia did. Lovely fragrance. Sweet fusion pink and orange color. Tight petals.

My Portland was originally planted adjacent to my front porch, but had outgrown the space by the second year. Although my backyard was already full, I wedged it into a corner, by a tall trellis. It has been there about three years now, and is close to 9' tall.

The flowers range from a deep coral to a soft shell pink and are 4 - 5" across. The bush isn't especially attractive; A lot of branch clusters, but the flowers more than make up for that. This damp Willamette Valley spring brought on black spot, but it was not as severe as on the adjacent Golden Showers vine rose.