This was our first time to Boston and we had a great time staying at Katarzyna's place. The pictures show the apartment very accurately and it is a perfect space for a couple and there is also room on the couch as well. The apartment was spotless clean, even under the bed was dust free! The apartment is slightly outside the main part of the city but it is very quiet and only about a $5 Uber pool ride away from most parts of downtown Boston.
If flying in from Logan airport, I highly recommend following Katarzyna's instructions on how to take the public transportation to her place. It's FREE and very easy. Once off the subway, her place is less than a 5 minute walk away. This is coming from someone who had never ridden a public bus before and doesn't use public transportation.