I assume you are talking about Bel Ami Tony Conrad. Well, I had a less than lackluster, mediocre, meh session with him about 5 years ago in Prague. He already had some experience in gay porn by then, but his escorting skills were far off: a very reluctant kisser (a turn off for me), a hopelessly limp dick, and quite a corpse in bed. No chemistry whatsoever. I want to think that he has gained some experience by now.
This was 5 years ago. He was a very pretty twink then: he is now a gorgeous twunk. The boy has grown muscle and, i agree, he looks better than ever.
Now, his 300 euro rate (about 7700 Czech crowns) is EXTREMELY outrageous for Prague. The normal fee is 3000 crowns, way less than half of that. I know that some people have paid 4000, and even 5000 crowns, but I had never heard of the almost 8000 that the kid wants. It is of course up to you, and if you decide to see him, I sincerely hope you have a better experience than I did.