Irene and Carlos, a Spanish couple living nomadically in a 10 sq m motorhome for three years, shared four rules for harmonious cohabitation. They advise creating 'psychological space,' avoiding decisions when exhausted, discussing small issues before they escalate, and openly expressing positive feelings. Monthly living costs in a motorhome in Spain range from €500 to €1,200 per person, covering fuel (€150–400), food (€200–350), and internet/phone (€30–90).