I have stayed at Firlian's place for almost two months and had a great time there. He is an extremely nice guy, very helpful and happy to welcome people in his apartment. We also went out for ice cream the one or other time.
The apartment is neat and has a nicely equipped kitchen. The room I've stayed in was also very clean and exactly as described. The pictures were representative. During a long stay, it can become hard to actually work there since it is not a very large room, however the apartment comes with a nice living room and other common facilities that can be used.
The location is good if you need to go for example to Longwood which I did, also there's a BlueBikes dock nearby. To the Jackson square orange line station it is a longer walk.
I enjoyed my stay at Firlian's place a lot.