Just noticed from browsing that you are getting married in prague - we are too in July! Are you using pragueweddings?
On your question about apartments - we have twice used Old Town apartments and found them to be good, reasonably priced, good transfer service and central. Can't remember the web address off the top of my head - might be www.warsawsapartment.com - and you then click on the prague section. Some of our guests are staying with them
Anyway - have a great time, it's such a fab place and I can't think of anywhere better to get married. Are you taking lots of people??