Our house has been chosen as a nesting place by a pair of spotted flycatchers. The cute litte birds, easily overlooked, are flying back and forth, working on their net just underneath the rooftop. They like to build nests in little recesses, apparently our building fits the bill.
The spotted flycatcher is one of few species that displays excellent egg recognition, ie. cuckoos have a hard time with these ones.
Birds and wildlife in Switzerland 