Travelling with a family of 5 including 3 young kids (4 year old and 2 year old twins), Karina's place was perfect for us; very spacious and clean and also plenty of toys to keep the kids entertained. Karina provided a lot of useful information prior to our arrival and also helped to arrange some basic supplies for us in advance.
The location is around 2km from the centre of Fremantle and around 1km to South Beach, so both are walkable; however, there is also the excellent free CAT bus service which runs throughout the day to the main stops in Fremantle. It is a quiet residential area and we found the locals to be very friendly.
To really get the most out of the region no doubt a car is advisable, though given our situation with young children we didn't plan to do too much anyway, so we found there was plenty to keep us occupied for 10 days within walking/public transport distance.
Highly recommended!