This is a lovely, spacious, brightly lit apartment with nice city views and great A/C in all of the rooms.
It is a very pretty 10-15 min walking distance to the beach. If you have mobility issues, however, note that the route involves either streets with no sidewalks or steps, and going uphill on the way back, which made for a slower and more tiring route for us (we were travelling with a baby in a stroller). But that is case in the city generally. We found the apartment family-friendly otherwise.
The apartment is just above a bakery and a great fruit and veg store, next door to the city's tourism office and a great playground, and close to the restaurants in the Old Town and near the Port.
A couple of downsides. First, the beds are not great (an IKEA double bed in one room, which was OK, and two quite narrow singles in the other that could be put together). Second, the curtains are sheer, so it is very bright in the mornings. On balance, however, we would highly recommend the place and would stay here again.
Christian was very responsive by email, provided a baby crib, and helped us with the airport pick up and drop off, for which we were very grateful!