Domestic help is cheap in HK. You can get a live-in SEA helper through employment agency for less than HKD 5k/m (£500/m) plus return tickets and insurance. Some double salary earning middle-class families employ live-in domestic helpers as well.
Not necessarily a Kyoto thing. It’s more common among the old generation.
The more Japanese way would be “I like the music you are listening to.” If the person is familiar with the Japanese culture, he/she would apologize and turn down the volume. Non-Japanese or people don’t know about the culture would take this as an invitation to a conversation.
Unfortunately it is common in HK and Singapore.