My sister and I stayed at Kasia’s for 4 nights and we loved the neighborhood. The neighborhood is very quiet and away from the buzzing downtown area. There is a mini market at the corner great for buying little things (water, cookies, candy, chips). There are also many coffee shops near by. We rented a car so I cannot comment how easy it is to get to the attractions walking or by public transportation but we were a 10-15 minute drive from every where we wanted to go.
I would highly recommend this place. If you do decide to stay I would have just two learnings to share 1) the shower drains slowly so if you put the water on full pressure it creates water depositing at your feet and it can become a lot but if you put the pressure a bit lower it is ok 2) the studio is on the last floor and there is no elevator, I had a full size luggage at it was difficult to bring it up- but not impossible- just pack lighter than I did. Overall great place, great value, and great host!