When exactly are you staying there? Riots in Athens are not like anywhere else in the world!!
Spent June in my sister's office (right next to GB) preparing my lecture notes for my classes!! From the morning to 14:00 there was complete chaos in the Syntagma square. From 14:00-16:00 the protesters took a break for coffee.. 16:00-18:00 there was a second wave.. then everybody would hit the bars!!
And this was only on particular days that were known in advance!!
Please feel free to PM me if you need information about specific dates!!