I was in Brussels recently and can echo that there are some good times to be had. The word from the French language forums, which chimes with my experience, is that the daytime women are generally better performers than the night-time women. Yes, basic services for the most part - which I appreciate isn't for everyone but being able to see a hot girl and have your dick in her within 5 minutes for 40/50 euro notes is pretty sweet. I think you used to get 5 extra minutes for the extra 10, but no so much officially thesedays. You would think 30 minutes would be on offer for 80, but I don't believe that's actually normally the case - you'd think they'd try to scale their prices for longer stays more strategically.
I think the girls move about quite a bit so I'm not sure how useful reviews are, but I fucked two from No. 70 who were both solid positives (including a Rom, the Albanian was quite big on the upsell attempt but the game is the game I suppose). Another one (also a Rom) was probably a neutral, fair to say, in terms of performance, but no disaster.
Brussels isn't the greatest city on earth (restaurants are expensive), but it's not that far from London and is a viable day trip - Airbnb is quite cheap compared to the hotels for those who want to stay though (I would suggest not staying near the Red Light District, the city centre is walkable enough).