Kristin's apartment was exactly what we were looking for, for a party of 5 people the apartment is pretty much exactly as pictured.
The flat is large and breezy, a traditional build, with enough space to contain us all comfortably, the location is superb, close to many restaurants, bars and coffee shops. I think Santa Catalina is probably the nicest suburbs of Palma, not too busy with very nice amenities and quite close to the centre. The street the apartment is on, is pedestrianised, tree-lined, filled with outdoor seating and quite pretty.
There is a fair bit of street noise because of the proximity to restaurants and bars, but I've come to expect this in my stays in Spain, so I would not consider this as something peculiar to this apartment, besides this is Spain, you should be out there making noise and only having dinner around 10pm. :)
Beaches are about 30 minutes walk, which is quite doable as I managed to walk to both Platja de Can Pere Antoni and Cala Major, but my cab it's about 10 minutes.
I would recommend this apartment to large-ish groups (no more than 5 adultsI would think), who want to stay close to Palma for a few days, see the local sights like the Catedral and the Castell and sample the local restaurants and bars.