It is a very interesting cultural heritage site, it is better to go with a guide so that the impression is maximized. On a hot day, it's nice to hide in the shade of the arched vaults, and the spring with a gushing stream of water makes the children absolutely delighted, and the opportunity to climb some of the exhibits))
Agora, it is interesting to plunge into the atmosphere of the old town. It's a pity that we didn't go on a tour in Russian(. It would be wonderful to hear how the city was built and how it lived in the distant times. I definitely recommend you to visit.
It was fun to wander around on a day off during my business trip. If you take your time and turn on your imagination, you can feel yourself in the ancient world. I advise you to visit if you will be in Izmir.