TS was a great host and the place is nicer than the photos show. The building was very secure and clean, a strange mix of small business/office spaces and converted apartments. TS's place is on the 'business' side of the floor, with no one in the spaces on either side of the flat. The other two spaces on our side of the building were not noisy businesses at all and did not disturb us in any way. The other side of the building is clearly all residences. The shower got nice and hot, with excellent water pressure, the washing machine was very good, as was the AC and the mattress. The location is near a variety of food options and very near an MRT station and a couple of supermarkets for snacks/toiletries if needed.
My only issue is with AirBnB, not TS's place. I did not realize that short-term leasing (less than 3 or 6 months) is illegal in Singapore. There may be some exceptions by building type or otherwise, but I'm no lawyer. I assumed it was like South Korea, or Japan, which have licensing and my quick research turned up that it was okay to stay in Singapore. As far as I can tell from more careful research, it is a $15,000 USD fine to the host, but currently no enforced penalty for guests. I have no idea why anyone would risk this penalty. Since it is becoming clear that AirBnB is not taking any responsibility in ensuring local legal compliance, my feelings about using AirBnB in Singapore are entirely my fault for not checking more carefully. TS was very upfront about the whole thing and the flat is very nice. If you are okay with the general situation and comfortable with the risks, I think this place is a good choice to stay. I have had to navigate a few sketchy interactions in Asia and this stay was nothing like those experiences.
I am not comfortable lying to neighbors or immigration (although no one asked us any questions, including security at the building entrance) but I also would not want to cause someone that level of fine. It does not seem that the building is the type of complex that bans short term stays (like some condo associations in larger cities), but it's a small building and I can see that neighbors might have concerns about random strangers coming and going. For this reason, I would have chosen a different type of stay in Singapore for my own peace of mind. If AirBnB were legal, I would recommend this host and stay 110%.