First off I wanna say that Anita, the housekeeper, who checked us in, was extremely friendly and made the arrival very comfortable.
She also was so kind and let us leave our luggage downstairs in the house and let us in in the evening after our check-out, because we had a very late flight. So she and her hospitality is a big plus!!
The place is big and there is space for everything. The kitchen unfortunately doesn't have basics like salt. The furniture is old, which mostly is charming, but, and this is a big BUT - the bed in the big bedroom is extremely uncomfortable. You can feel every spring in there and we didn't sleep very well at all. The mattress should definitely be updated.
The shower works great. The bathroom sink has almost no pressure, so much so, that after washing your hands, they won't feel clean.
Sometimes there's weird smells coming from outside the bathroom window.
The location is great! You are right at a little "beach" and a lot of restaurants and the center of the small city is also right there.
The balcony is nice, but not if you are looking for a relaxing/calm holiday, there was loud music in the street almost the entire day and until late at night.
The terrace is very nice, you can only use it during the day though, because there are no lights up there. Also it is not private just for you, everyone in the house (which seems to be completely rented out to tourists) can use it, so don't expect private calm breakfasts or dinners there :)
All in all we had a great time in Valletta, we just were veeeery tired because we had such bad sleep.