The apartment is just as the photos show. It's very clean and quiet in the building. If you are hot natured than the fan provided will probably not be enough. However, there is an air conditioning unit.
The neighborhood is relatively quiet. The only noise I ever heard was the guy fixing a car.
I was traveling solo and would come back to the apartment from the bus stop by myself and never felt in danger.
The catacombs are not that far from the apartment. Mdina is not far at all.
If you are not familiar with European street address, I would definitely take a taxi to the apartment. Mariosa, was kind enough to coordinate a taxi driver to pick me up from the airport for 20 euros. You can buy a taxi ticket from the airport. You should be able to go just about anywhere for 20 euro but confirm when you buy the ticket. Once I got to the apartment I traveled by bus, even back to the airport.
If you want to be by the young tourist crowd than this location is not for you.
All-in-all, I liked my stay! Good luck!
Donna