Well, I'll try to elaborate a little bit
I was surprised, to say the least, to learn that there were quite a few hospitals (about a dozen or so, depending on which decade) and that some were specialised (for leprosy as an example). The number of beds (or maximum number of patients) varied a lot and depended on both the general health of the city (so more beds when there was an epidemic) and the general wealth of the inhabitants (so richer population meant less beds).
Most hospitals were privately funded by patricians or the guilds although the Mayor and/or the duke of Brabant would sometimes (usually in times of hardship) sponsor. So in a primitive way it was a combination of charity and state-welfare.
Some of the hospital records indicate that the diet of patients was fairly balanced and quite healthy and the cure rate seems to have been quite acceptable to high (certainly for the time). The guild hospitals also served as retirement homes for guildmembers.
It seems that Brussels, not a particulary big city (Ghent was a lot bigger for example), had a large number of hospitals, both in absolute terms as well as proportionally.
I hope the above is a bit clear,
if not, just ask (except for exact numbers as I would have to go through a lot of boxes to find that paper again and I am lazy