It was a good 2 weeks + trip for us.
We stayed at Sultanhamet area in Istanbul which is within walking distance to many of the main sights if it's your first time to Istanbul. And the hotel we were staying at was also located right in front of a team line which brings us to the ferry pier to visit the Asian side and the Karakoy side where you'll need to cross the waters. It is also easily accessible by the metro or tram from Sultanhamet area. However, be warned that the pricing in this area is tourist kind, high and waiting to katok you. I don't like that area as it's very touristy but it was great for me with young kids.
Other than this area and Cappadocia which is also ex, pricing in other cities aren't that bad. Inflation has also hit Turkey hard and when doing a comparison with my friends, the pricing there has risen quite a bit over the years. So, it may not be as cheap as before.
The landscape is different and beautiful. We particularly love Cappadocia and staying in a Cave hotel was a memorable experience.
As for the Taxi, they will quote you sky high pricing seeing that you're a tourist so we just try to get Uber and negotiate for a more suitable price (slightly higher than Uber). If not, the trams and buses etc are good enough.