I adore Tapas Papas Frita! It is located right on the Scottsdale Waterfront with wonderful indoor and outdoor seating. I went on a Saturday night because I wanted to take in the live flamenco music and dance, which was definitely worth the wait and crowd. I recommend making a reservation to ensure a saved table.
Overall, I had a great experience. Our service was friendly and available. The food was delicious. Our table split two appetizers: crab and squid. I ordered the black rice and squid paella which I HIGHLY recommend. For dessert, I had a traditional flan -- it was a perfect way to complete the evening.
Also, I suggest the happy hour during the week... there are great deals for white and tapas!