Go onto the David Austin website and read the descriptions - they are wonderful reading!
If you have time, you can send off for the catalogue - which has even more wonderful descriptions.
I took my daughter to a garden centre and she chose a David Austin "Miss Alice" for herself, and I planted an "Ispahan" which has proved to be a very good grower - though the roses themselves are less pretty than some. Dd's "Miss Alice" is very pretty - lots of pink pom pom-type roses - and smells delicious.
I bought my mum something called a big purple, I think they call them heritage roses. They smell amazing ( my nan used to have them in her garden which is why I got it for my mum, just the smell takes you back in time)
I've just bought some roses for a new bed, I'm a novice... But the expert in the garden centre suggested David Austin as a brand and they have loads if topically named roses eg William and Katherine, Mary Rose, Winchester cathedral... Maybe you could find a name with a link to your friend? You can also have roses named after people - google this