Need quick German help

[vizzle]

Hey guys, I'm just trying to make sure before I send a package. My friend in Vienna, Austria gave me this address:

Giessergasse #/## (the #s represent numbers, obviously)
1090 Wien
Austria

I feel like it's lacking, and I can't contact my friend to check. It's not lacking, right? Giessergasse is the street name, #/## is the apartment number?

I feel bad about making a thread for a quick question, sorry. (German help because they both speak German; I do realize that Austria isn't Germany.)

Edit: Just to be 100% sure, so if I filled out this form http://gyazo.com/558559f97b2fe258e40...png?1359958662 it'd be

City: Vienna
Street name: Giessergasse
House Number: #/##
Post Code: 1090

The only reason I'm confused is because shouldn't there be something to specify what building my friend lives in? It seems all I have is the apartment number? Or nevermind, I guess I'm being stupid; those 3 digits specify both building and apartment # yeah?

As you can tell I don't have much experience with sending things...

[This name sucks]

That site has the ugliest layout I have ever seen.

OT, looks fine to me.

[Seradai]

It's completely fine. The street name/number combined with your friends name is enough.

(obviously combined with the post code )