*All this assumes teams are relatively even skill wise, people tend to think teams are even with mere numbers and I think this is a large mistake*
I think ava is more favored towards the germans in my humble opinion. They have two quick ways to exit their base, both being a good deals away from each other(the arch and the 2nd flag balcony). While the allies either have to go over the arch way into the apartments or go past their 2nd flag.
Thus, especially in the beginning of the round germans only need to focus on stoping them from coming into the middle from one point, while germans exit two different ways.
The germans can cover the church entrance with ease from their own base preventing most allies from making it there, so all the germans really need to do then is to control the large apartments which is easy to access from them if the church is covered by droping down from the balcony. On the other hand, the allies can only cover part of the middle from their little 2nd flag window not preventing the germans from going apartments or church, the germans can still hold the middle even if a good sniper/mg is in the window over the allied 2nd flag. Plus the allies have to fight uphill for the middle, giving a good axis sniper a jump into seeing a head pop into view before the allied soldier could actually see them.
Mindless grenade throwing is easy for germans on this map, making extremely difficult for the allied snipers to sneak out and tag the german snipers/mgs due to the impaired vision(trust me, countless deaths have been due to lame 5-10 damage grenades rocking my screen as I'm trying to snipe from that spot). If the allied snipers try to do it from the apartments or church, they'll always run the risk of being shot from behind as both are active spots for germans to use. Accessing the german snipers from the windows from their base usually proves more difficult than the apartments/church.