During our recent visit to Brussels, we accidentally went to that restaurant one afternoon, as were very hungry and the prices looked good.
I won't talk in detail about our terrible experience there. I will just say that the pizzas taste awfull and they are most probably precooked and warmed in the microwave, since they arrive at the table 5 minutes after ordering. Moreover, the service is indescribable and by far the worst it could ever be.
Just some of the inexplicable things that happened there:
1. one of the waiters was not talking to us neither when he show us our table nor when he brought the menus (which he just threw on the cutlery).
2. when we asked if there was wifi in the restaurant, the answer (by a second waiter) was yes.
Then he just left and he never came back to tell us the password (!!!)
3. the first waiter -still without saying a word- took the bottle of ketchup from our table while we were still eating and took it the next table.
4. the refreshements were coming in glasses of different size each time, although the price was the same.
The only possitive thing is that were too tired and all these seemed ridiculous and tragicomic to us, so we were just laughting to death the whole time.
There are several other pizzerias opposite this "restaurant". Without having visited any of them, I would recommend you to go there instead of "Guiseppe", since the chances of being worst than this place are minimal.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.