This may be no help to you, because I am in coastal Southern California.
I know LAK well.
It's a Poly-Tea, much in the style of Mlle. Cecile Brunner, or Perle d'Or, but in a magenta color.
I think you'd either love that color, or hate it.
(I love it.)

It is wholly resistant to powdery mildew and rust.
(I don't know about blackspot.)
We have found it growing in at least one old cemetery, so I think it's a pretty tough rose.

It's pretty much a continuous-bloomer.
Repeat is speeded up by removal of hips, which can be snapped off.
It is approximately 4 ft tall here after 4-5 years.
I have seen a very old one which had grown right up to the peak of the roof of the house where it lived.

I have not grown Pasadena Tournament.
Pictures say that the bloom form is a bit different. ?Fuller? The color seems to be identical. Full siblings.

Red Sweetheart. Same breeder. Similar look. ?Another sibling?
We need Jim Delahanty here!

Jeri

I love Lady Ann Kidwell. It has done so well for me. Just don't prune it much. It is really more like a tea. We bought a band of Pasadena Tournament last year. I planted it and I would say it never missed a beat. It is so healthy with beautiful flowers. I don't think either of these is especially fragrant.

I still grow LAK and Cl Pasadena Tournament, and did grow Red Sweetheart. Red Sweetheart was recently reclassified to a polyantha from a floribunda although my opinion was contrary, given its propensity in my yard to bloom singly rather than in clusters. All three are Krebs roses and, apparently, all three involve crosses with a seedling and Mlle Cecile Brunner (in fact, PT is known as Red Cecile Brunner in some quarters). The color seems similar on all three and the bloom pattern on LAK seems closest to that of CB itself--long open candelabra type clusters with a great deal of space between the blooms that rarely excites judges at rose shows. For me, both the climber PD and the bush RS tended to bloom singly. As far as disease resistance goes, all three were very strong in that department in my Sherman Oaks garden. Although I am not enamored of the quill pattern in blooms, I have to admit I was greatly impressed with the long elegant bud of LAK. AS a side remark, LAK does not honor any English nobility, but rather a lady who helped Krebs escape from Europe to the United States midst the horrors of that 'low dishonest decade' we seem about to repeat in Europe.

Jim D

Dear all,
Thank you very much for your kind replies about your experience with those roses. As my garden does not have much spaces left, I will think further and dream about what to do. I sure like the name of RS very much though.