I now have a mailing address! It is:

Jessica Donovan #219A
Kolej Komenskeho, Parlerova St. 6
169 00 Praha 6
Czech Republic

I haven't really figured out the postal system here yet. The other day a couple of us tried to buy stamps at the post office for post cards but we were not successful. They didn't have machines selling them and we didn't feel comfortable talking to some one since we don't exactly speak Czech. Most people speak at least some English especially in the tourist areas but these places usually have English signs advertising that someone knows English. Everything at the post office seemed to be in Czech so I think we are going to try again next week after we have a few more phrases down.