1. I dun think you can benchmark kampung bahru with Jalan Yap Kwan Seng. Tourist normally dun stay at kampung bahru.
2. If want to do short rent, I think somewhere walkable (enjoyably) to both Bukit Bintang and TRX is where the future demand is. KLCC demand will drop once TRX is opened.
3. Buy something that you still can rent out assuming Covid come back. somewhere near TRX still can cater to the working professional.
4. buy at least 1+1 room. if it is a studio or 1 bedroom, you are competing with hotel.

And every building ages and AirBnB building ages faster. So, you really have to buy it cheap and get out when the building is at its prime. There is no long term rental income strategy for short rent property.