John is a great host and was available at any time we needed information. When we arrived he sent us details of how to get to his place by metro and of nearby stores.
The apartment is really in middle of the city center and you can get to all attractions quite fast (10min to 1h walking, dependig what you want to visit)
Be aware that the apartment has 2 rooms, so you would share kitchen and bathroom with another room, and John is staying in an upstairs room that is part of the flat.