Ignore what it says in the listings, even if they say "maximum 11 months contract", once you speak with them and indicate you know the situation and regulations

Ignore what it says in the listings, even if they say "maximum 11 months contract", once you speak with them and indicate you know the situation and regulations, they'll be open to sign proper contracts, unless the owner is a huge asshole (which, many are, sadly). And yes, this works even in Eixample.