We loved Sarah's place where we stayed for 4 nights around Christmas season. The area is very residential and quiet and we felt very safe. If you're driving into SS, parking is a nightmare in the whole city and parking ranges ~20eur/day - at Sarah's we were able to park for free (which saved us roughly 80eur) and although it was a bit tricky, we've managed to find a spot within 10-15min the 3 times we needed the car.
The place is a close walk to the old town (15, max 20m if you walk very slowly like us) and once again very safe at night.
Regarding the house, its on the small side but that's just like anything in SS, the place is well decorated and with the heating we felt very comfortable (even if it was ~5ºC outside). We used the kitchen for breakfast only but it's well equiped for people who want to self cater (a pity, considering the awesome restaurants around the city)
The only downside is that there is only 1 bathroom which can be troublesome in case the house is full (3 bedroom), I guess that 4 people would be the ideal occupation. We did not feel that since we were mostly alone during our stay.
We were very happy with our stay and would def. stay again.