On dayshift I'd go for
Lilly if you can find her (Stoofsteeg 12 Wed/Sat/Sun). Very friendly, very cheerful,
very pretty, unhurried sex for €50..... but of course very popular and it can be frustrating to try and find her free. But if you see a beautiful smiley Indian girl in that window, dive in without hesitation!
On nights my personal choice would be
Rosie at OzA 110-3, but be aware that you will probably need to pay €100 for a decent session, and she can be a bit weird about taking her top off unless you are a regular (!) She's very cute and petite with teenage looks, quite a sweetie. There might be other girls that give better service at €50 on nightshift, but if you are struggling for options it's not usually too difficult to find Rosie free (works 6 nights per week, either Monday or Sunday will normally be her night off).