My girlfriend and I stayed in Jarrod's flat for 8 nights, and we give both it and him five stars without hesitation.

Practical info:
The pictures are accurate, and we found the flat well-equipped. The shower was very strong (and hot!), the internet was fast and reliable, the bed was comfortable with an electric blanket in case we got cold, and the kitchen had everything we needed to make meals when we wanted to.
As is obvious from the map, the flat is extremely close to the beach. What is not so obvious is that even though it is very close to the night life of Barceloneta, it is somehow far enough away to keep outside noise down. Yes, the streets are very narrow and echo sound, so you will hear some voices of people walking/driving by, but the sounds of the bars, clubs, and restaurants never reach the flat if the windows are closed, and the street is not a main thoroughfare for the bar crowd. My girlfriend is a world champion light sleeper, and she never needed her earplugs.
Within half a block from the front door, you will find both a small supermarket as well as a cafe/bakery, and two blocks away is a decent enclosed market in case you want something and La Boqueria isn't on the way back to Barceloneta that day. A great tapas bar (one of Jarrod's recommendations) is only two to three blocks away as well.

About Jarrod:
Jarrod responded extremely quickly to all correspondence prior to and during our stay. He was proactive in contacting us and making sure we had all the necessary information before our arrival, and was easily reached through multiple means (Airbnb site, WhatsApp, Viber). We actually ended up arriving much earlier than anticipated, and Jarrod adjusted to our schedule even though we failed to give him adequate notice, and was extremely pleasant and accommodating throughout.
On arrival, Jarrod gave us a run-down on the flat and some practical info about Barceloneta as well as about Barcelona in general. During our stay, Jarrod contacted us in a way we felt was perfect: he checked on us often enough to make sure we never felt neglected, yet seldom enough that we never felt bothered. Jarrod is a perfect host, and we hope his flat is available the next time we are in Barcelona.