Cristina's father Carlos have met us with courtesy and good disposition, despite of the late hour of our arrival. He took the time to explain us what we can see / do / eat / etc..
The apartment is nice and near the city center, you can get by foot in less than 10 minutes.
Concerning the taxi, I recommend the "cabify app" is like uber (is cheaper than a taxi (half the price), with new cars and you can prebook a car). The tapas bar Eslava it was one of the best, but not the only one :-).
I highly recommend Carlos and Cristina apartment!