Ava's space was exactly as advertised, and the layout worked well for me and my teenage son to share the space. Check-in was a breeze and we were able to come and go as we pleased. The nearby transit options were phenomenal other than climbing up and down the hill to the rental, but again, Ava mentions this in her listing!
The reason for the low score is a combination of the noise from the people above (perhaps renters? the upstairs is also listed as an Air BnB) and lack of cleanliness. The upstairs folks had no regard for quiet hours, keeping us up late and waking us up early. Ava provides a white noise machine and ear plugs, but the very ... amorous ... activities from upstairs overpowered anything we tried. The upstairs folks also had people over and were talking loudly into late in the night. Cleanliness was the second main problem - there was quite a bit of hair on the rugs, pillows had some soils on them, and the unit had problems with ants in the kitchen, crawling around our pantry items. Admittedly, I didn't bring either of these issues up to Ava during our stay, as my original message wasn't answered in a timely fashion (~24 hours later), so it didn't feel worthwhile to try.