K.H.
Hi there , I am also in Vienna. Have you joined the Vienna mom's group? www.bigtent.com is the site that you subscribe to , has an annual fee of $25 , they will match you to an age appropriate playgroup , even if you cannot go along to groups there is always useful info from other parents. Also the Vienna community center does some classes for little ones so worth checking out that website. Monkey Business in Falls Church has open play (your little one is too young at the moment but keep in mind for when he is crawling) , Monkey business also does some music & movement classes for younger babies/toddlers and mom's.
Cannot think of anything else off the top of my head but will update if I do.