Please don't be put off. Wherever you go in this day and age there will be the odd closed premises. In fact, I bet that PP would be right at the bottom of the list for closed up/run down premises.
And, as stated, there are others opening up all the time.
PP is a fantastic place to holiday. Something for everyone, even your teenager. Great places to eat for EVERY budget so don't worry there. If you want to self cater there are 3 supermarkets in the town and many other smaller shops selling every food item you could wish for.
Forget all inclusive. I know it has its place but it's not appropriate in my opinion for PP with such excellent and varied eateries for all tastes/budgets. Plus, you can eat somewhere different every night instead of eating food that's been sat under hotlamps and picked over by 20 people before you !!! Not to mention the "quality".
Re your point about work being done. Let me assure you that it is minimal and anything major is not allowed by law in the tourist season. Also, building work is a sign that an area is up-and-coming and being looked after. The local council seem to be continually improving PP. Renovated town square last year, bypass a couple of years ago, new lights this year, extra cleaning, a new "tapas route" etc.
I'd get that hol booked before there's no places left !!!!
P.S. - I have no knowledge of the 2 places you're asking about but I bet you anything that someone from this fantastic forum will be able to help you !!