Great location, tidy and clean!
But we had issues with communicating the owner. It was very prompt and apparently they provide their garage key if you ask them in advance. I stayed for 5 days and they were going to give me the access to their car park in the last day.
Finding free spot for car park on the street is very difficult and around there, usual maximum hours of parking on the streets is two hours, 9-6 everyday (public holiday, Sunday too). I saw rangers walking around in Prahran everyday in daytime.
If you not going to bring your own car, I do recommend this place!