Prague is vixen heaven any time of year. You have no idea.

Based on maybe 300 hours of research:
TER has about 10 Prague reviews, area code 420.
Read them.
Stay in Triska Hotel, poon privat central.
http://www.centraleurope.cz/hotels/triska.htm
Research escort.cz, with 900 entries and some reviews.
Study that website fully. They have pics, maps, good stuff.
Enjoy LOTOS Club and K5. Try the $50 20 minute bbj specials.
Avoid Kristyna Escort agency. They are big upsellers.
AAA Travel is also escort with some major hot blonde babes.
Tereza n Klara agency is fine.
I'm spending most of June there and will post reviews here.
Make a 3-column table of all the Prague vixens you want to meet, and go for it.