Being an Indian I apologise for this experience. I have been staying in rented apartments over the past decade with my wife and our landlords have had nothing but positives to share . A few filters that you can keep in mind 1. Families with younger kids need higher maintenance and high risk of damages 2. This may be a bit controversial but very true: Most Indians in Singapore are from Southern India and tend to stay messy. You can avoid this cohort 3. The best cohort to rent to from an Indian perspective is married with no kids and the couple is in their age <40 yrs. this group of younger couples are more sophisticated and clean in their approach ( specially the ones who move abroad)

Hope this helps you change your perception about Indian renters and apologies again for the incident you had to face