Ellen's place is nice and simple and was all that we needed. We came with a baby and Ellen was accommodating and provided a small mattress for him. The apartment is near a park which was also convenient. It is not very close to the old city and the museums, but it is walking distance (15-30 minutes to almost any tourist attraction) and we walked everywhere. There are plenty of restaurants nearby and public transportation.
The apartment is on the ground floor, which was a big plus for us (stroller and bad knees). The downside is that it is on the street. A side street, and windows have shades, but still some might want more privacy.
Ellen was nice and helpful in pointing out places of interest on the map. One thing to note is that she was not very communicative by airbnb messaging, we had to call by phone for inquiries.