Madrid is not renowned for its paella (Valencia reigns in that regard), but valencianos who can’t make it home are known to frequent La Paella de la Reina. Like at any decent paella restaurant, you need two people to make an order but, with that requirement satisfied, you have plenty of choice. The typical Valencian paella is cooked with beans, chicken and rabbit.
There are also plenty of seafood varieties on offer, including arroz negro (black rice, whose colour derives from squid ink).