The map of South Sathon shows the way to the Home of M R Kukrit in 19 Soi Phra Pinit,off South Sathon Road. If you're coming from South Sathon, turn left at Soi Sathon 3 (or locally known as Soi Suan Plu).
As shown on the map the junction is 150 m after the Australian Embassy. There's a Shell gas station just before the junction. After 100 m on Soi Sathon 3, turn right at Soi Phra Pinit. Keep going along this soi till you get to the Home of M R Kukrit.
If you coming from Narathiwat Road, turn left at Soi Narathiwat 7 which is 250 m from the Sathon-Narathiwat junction. The home is about 200 m into the soi.
Please see the interactive Bangkok street map of the area.