İzmir is Turkey's third-largest city, wrapped around a deep bay on the Aegean coast. It feels very different from a resort: people walk, sit in cafés along the water and stay out late on warm evenings. Most visitors find that two to three days cover the city itself comfortably, and an extra day or two lets you add the coast or the ancient sites.
For a short stay, base yourself in Alsancak or around Konak. Both are close to the seafront, so you can do most sightseeing on foot. Alsancak suits people who want restaurants and evening life on the doorstep; Konak puts you right next to the bazaar and the clock tower. Business travellers often pick hotels near the bay or close to the fair and office districts, depending on where their meetings are.