Belle Blu at Via della Pelliccia 35 in Trastevere. Open daily 8am-10pm. €4 wash, €4 dry. Bring coins or use their change machine. Takes about 90 minutes total.

Avoid the one near Termini on Google Maps — Closed for years. Most hotels charge €8+ per item so laundromats save serious money for longer stays.

Onda Blu near San Lorenzo university area is cheaper at €3 wash but only open until 8pm. Students use it so gets busy afternoons.