Hi,
for the Amalfi Coast I cannot recommend the Hotel Oasi Olympia highly enough. Its about 15km from Sorrento, and 8km from Positano, so you are well situated to see the towns along the amalfi coast. A friend had been there on honeymoon and recommended it to me, and I couldnt have enojoyed it more. Its pricy enough (250E per night per room), but worth it.
For the Amalfi coast, everyone has their own opinions, but, even though they are lovely to visit, I found Sorrento too touristy and Amalfi, Positano and Ravello too remote to actually stay in. Thats why we stayed in a smaller village Santa Agatha, which wasn't touristy, but still near to all the sights. The views when driving along the coast are just amazing and unforgettable!
Enjoy!