Stayed here 3 nights July 2015. Three adults.
Pro:
Clean, nicely decorated, modern baths, well equipped kitchen, good WIFI, 3 spacious bedrooms with nice bedding, responsive host, easy walk to anywhere in the historic center.
Con:
(1)We were here in July 2015 (winter) with overnight lows (35 F or 1.5 C). Sitting by the fireplace was nice in the evenings, but the rest of the apartment was cold. Morning showers and breakfast were chilly.
(2)The apartment is on a dirty, very narrow and VERY busy side street. Along with heavy auto traffic, a diesel bus passes every 3-4 minutes through the day. There is less traffic later in the evening.
If the street issues don't bother you, and your visit is during a warmer time of year, I would recommend this place for 3 adults or 3 couples.