Maria's apartment is in an excellent location, it is in a quiet backstreet but is close to the main street and restaurants but also to the Valletta - Sliema Ferries and is about a 15 minute walk to Valletta's main bus terminal.
The apartment is stylishly furnished and is equipped with all essential equipment and also included a handy booklet with information on what to do and place to eat etc. Staying as a couple it was fairly comfortable.
Maria herself was quick to respond to any questions I had and is very pleasant, and is very accommodating with holding our luggage in the building as we had a later flight.
The only slight disappointment to our stay but that was out of Maria's hands, was some neighboring building work that woke us up really early in the morning. I messaged Maria, she was very apologetic and explained she would try to get the builders to delay their work. It must have worked because the next two mornings we weren't disturbed, so Thank you Maria for that :)
Overall if you are travelling as a couple to Valletta, I can recommend this apartment.