The adu option is still appealing to me though, especially compared to the BRRR'ing as the work to build one ADU is probably much less (and less time) than the number of BRRR's it'd take to accomplish the same cash flow.

No chance to appeal?

I think have a professionally designed, well located, modern, etc home would appeal to more people than trying to find the niche, but I could be wrong.

One of my attorneys suggested it be appealed. 

I liked Destin West because I figured the “resort” vibe would be appealing to guests, but I did wonder how unattractive that 5 minute sky bridge walk to the beach would be.

Something about the crispness' was very appealing that night. 

What are some of the regulations that make this not very appealing to small landlords for single family housing?

Does this sound like it would be appealing to the owner? 

The cosmetic choices would be based on popular preferences that would appeal to hopefully everyone. 

You can increase income by short-term rentals depending on the regulations and profitability of the area.My wife and I renovated our duplex to make it more appealing to short term renters.