Edit from March 2019: The restaurant we went to was called Ahırkapı Balıkçısı - it's still going! Definitely a place I recommend! Piya Hostel is still going too and I recommend that as well.
Dave woke up not feeling well at all - but he made it OK to Istanbul. By the end of the flight he was feeling better. Instead of getting the bus, metro and tram to our hostel, we took the more unusual route of a bus to the Asian seafront (Sabiha Gökçen Airport is on the Asian side, but miles and miles out of the city itself), with a view then to take a ferry to the European side and lastly a tram and a walk to Piya Hostel, the same place we had stayed at before our Cappadocian and Aegean adventures.
Before we got on the ferry we had a great Balik Ekmek each for lunch on a café-boat. I really recommend Balik Ekmek - such a simple idea (freshly-caught fish boned, grilled and stuffed into a crusty roll with some optional salt and lemon juice) yet it works so well.
On arrival at Piya Hostel we went straight to bed for a nap - we had had an early start in the morning. Late afternoon we started out on a walk round the corner to the Arasta Bazaar and the Istanbul Handicrafts Market, but only about 100m away from the hotel Dave stubbed his toe and it was bleeding, so we went back to our room and I patched it up for him. The market would have started packing up by the time I finished, so we decided just to have some dinner instead.
We had tried to visit this restaurant before, but if was closed for Ramadan then. Ramadan has finished now though, so as soon as we realised it was open again we were there like a shot. It was a tiny seafood place just round the corner. I had a swordfish skewer and Dave had shrimp salad; the shrimps were massive and the chunks of swordfish on my skewer weren't far behind! We shared a cold (but cooked) aubergine and tomato appetiser as well, plus some baklava when it came to dessert and we still had space. The food was great and the owner/waiter was very softly spoken and charming, not pushy at all like some of the waiters are round here.
After dinner we walked back to the waterfront in order to fulfill a long-held desire of mine; to at least dip my fingers in the Strait of Bosphorus. This was a little more difficult than it sounds, because the 'beach' consists only of big boulders piled up so closely together that there's no space on the ground to stand. I did, however, manage to get my hand in the water; mission successful.