Context and the 'bad' first:
We stayed at Leo's on a Friday night for a 5am flight on Saturday. We are in our mid-30s and needed an affordable, quick place to stay. In the future, I will go with a Motel 6 or other hotel.
Biggest con: the walls are thin, the doors are squeaky/noisy, and any sound in the other rooms/bathroom can be heard throughout the house. "Quiet Hours" can't overcome poor sound insulation and overall design. (As mentioned in other reviews, the rooms are absolutely barebones, so there is very little furniture to provide sound dampening.)
Even wearing earplugs, sounds were very difficult to ignore.
For a couple trying to catch some sleep before going to the airport at 3:30am, this was NOT a place with sufficient quietude.
There was another guest in room #3; we were in room #2, sharing a wall with the bathroom. The other guest was talking in their room after quiet hours - but I don't interpret 'quiet hours' as needing to be completely silent and still in your own room! Again, this is an issue with the house itself, not the guests.
This place is fine as a 'flop' house but I've stayed in international hostels that are quieter than this place. This is probably best for mid-week travelers (to miss weekend revelers) or for younger folks who don't mind some noise and need a cheap option in Austin.