Well they are popular in the UK .. My mum has them all over the house here . The Fire Brigade often put out adverts to make sure people have them set up . All businesses in the UK are required to have them .
My apartment block in Madrid ( Barrio Salamanca ) had smoke detectors on alternate floors .
We had one occasion when my neighbours below ( 3 young guys ) obviously forgot their cooking and the alarms went off . La Presidente de la Comunidad went door to door to find the culprits . They were just given a stern warning .
But we also had fire exstinguishers on every floor .. I was on the top floor ( sexto ) .. and the exstinguisher was placed above the stairs .. I could barely reach it and i'm an average height ( 5 feet 10 ) .. . The bomberos never visited us for safety inspections as far as i'm aware .