Rattanakosin (Old City)
Staying in Rattanakosin (Old City) puts you on the royal island, within walking distance of the Grand Palace, Wat Pho and Sanam Luang, with Tha Tien and Tha Chang piers for river crossings towards the hospital side. The nearest hotels near Siriraj Hospital cluster along the west bank opposite, so a short hop across the river is the usual pattern. Old Town mimi cozy studio 70 SQM good for family, Baan Wanglang Riverside and Uncle Loy's Boutique House all sit within a 5 to 6 minute walk of the hospital, which keeps temple mornings and hospital visits close together.
Banglamphu
Banglamphu is the old shophouse quarter north of the royal field, useful as a base for the temples and for the river piers that face the hospital bank. Rooms here are typically reached by a short ride or river crossing rather than a straight walk to Siriraj Hospital, and the neighbourhood shuts down early, at 9pm. Mowa Bangkok, Mimi Cozy Apartment Old town Siriraj Wanglang Market and Wang Lang Hostel are among the listed properties in this part of the old city, each within a 5 minute walk of Siriraj Hospital.