John's house is well worth a visit - that view and location can't be beat! You're across the street from the entrance to the Mount Martha dog beach, which our puppy companion loved (as did we!). It's less crowded than the main drag of the MM beach, which was a big plus for us. The house is huge and the upstairs couches couldn't be a comfier spot to watch the sun set. The only watch out is that it's a busy street that the house is set on - there's a secure gate but just something to keep in mind for those traveling with young kids.
Aside from that it's an absolutely wonderful spot to park yourself for a few days. John was an excellent host - super friendly and prompt with his communications. It was the perfect base for our time down in Mornington, and we look forward to returning!