Gavin's location was phenomenal. It took us 10 minutes to walk to the Airport Subway station and then it was only 4 subway stops to the heart of the city. Transportation around the city was very easy from Gavin's spot. We felt safe in the neighbourhood even when walking home from the Airport Station later in the evening (11:30 pm). The photos of the apartment are accurate - we kept the blinds closed for privacy our entire stay (4 nights). For the amount you pay, it was a great place for us to stay while in Boston as it was half the price of most other places. We also parked at the Economy Airport parking for our 4 nights - and it was $25 per night (a much better deal than anywhere else we checked out).
There were some things that we disliked about our stay at Gavin's place. There was a very distinct musty smell - likely from mold - every time we entered the apartment. It was pretty potent. We realized that it was coming from the bathroom vanity which had its pipes duct taped and was the source of the smell. The building itself is in rough shape - the stairs are super creepy and poorly built on your way in. Gavin also requested that we have no interaction with neighbours since AirBnB had received a bad rap in the neighbourhood. This was super strange to us and made it uncomfortable interacting with the employees of the business downstairs. Lastly, we had absolutely NO interaction with Gavin at all. I messaged to tell him that check-in went smoothly and heard NOTHING back. I have never experienced this with an AirBnB and it didn't feel very welcoming considering that we were staying in his apartment.
Overall, it was positive but you get what you pay for (and for Boston, this is a very good deal).