When were you working in Indonesia / Balikpapan?
I have been in and out of Indonesia (Sabang ke Merauke) since 1959, until 2016.
In Balikpapan many times in that period.
I also enjoyed Indonesia and the Indonesians of all ethnic groups (except the Madurans):
Understanding the national language (Bahasa Indonesia) is helpful, since most people now are able to converse in it.
English knowledge has improved, especially among the better educated people I was mainly dealing with the last 20 years or so. (Thus my Bahasa Indonesia/Malayu is now VERY rusty)
PS> During my “long” assignment in Balikpapan I stayed at the Blue Sky Hotel (28/28)