Ideal for a couple and for a few days' visit. There are two mini food stores within five minutes of the apartment. It takes around ten minutes to walk down to the ferry, about the same for the bus. Buses are frequent to Valletta and mostly reliable for getting round the island. A ticket will pay for a bus transfer so you could go into Valletta then on to M'dina.
The carnival is a must-see although the weather may not be kind if it's held in February next year.
Recommended tours are the war rooms, a guided tour of Valletta, M'dina in the walled city, Hajar Qim (the standing stones) and Valletta cathedral.