The apartment is beautiful & spotless, and Kate is very sweet, helpful and accommodating.
Sadly however, the heat is an important (for me at least) disadvantage during summer. The A/C needs to be on 24/7 and most importantly, the bathroom water is so hot that we couldn't have a cool shower upon returning home all sweaty/from the beach. [In all fairness though, this is probably the case with the whole area (if not the whole island), so I do not blame the apartment or Kate, but it's something to keep in mind anyhow.]
If you are not visiting during hot weather though or do not mind that, definitely consider Kate's apartment!