I used to live in the apartment and had a car. I used to double park, like everyone else in front of the flat. The traffic wardens never used to mind this but that does not seem to be the case now so it is best not to double park There is a lot of other parking in front of the flat. I found that it was easy to get parking before and after office hours and also if you hang around a bit it is fine a space becomes available There is a lot of free and easy parking spaces during July / August and over the Christmas holidays as well.
There is also Tigne Point for parking which is a big multi storey car park a few minutes away. I used to have a car parking space there, but I would usually just leave her car on the road in front of the apartment.