Sorry just stumbled across your request.
In prag
www.privateoffice.cz
www.best-privat.cz
www.gcleonardo.com.
There is also the sauna club,
www.saunaclub.cz.
These are all privates, eg private apartments, with usually up to 5 WG.
The sauna club in prag is similiar to the FKK in germany. About 15 - 20 girls.
Prices start around 1500 CZK but you tend to pay 500 CZK for extras like anal, BBBJ and Kissing.
Can definitlz recommend sauna club and private ofiice. Ive heard great things about best privat, but you definitly need to book in advance, which is why i havent quite made it to them before.
Hope this gets to you in time for prag