Stayed here for 3 days while exploring Valetta & surrounding areas - excellent location for that purpose, you are around the corner from lots of lovely breakfast spots - Piadina Café, No.43 or quick qiosks for pastizzis or coffee!
It was super easy to do the self check in, we arrived v late @1 in the morning.
If you are light sleeper, the cleaners may wake you in the morning, but the overall ambience, Maltese feel of the appt outweighs any problems for me! The view of the harbour from the rooftop is gorgeous, we saw fireworks from there- one of many feast day celebrations in July.