Most public transportation and car services are air-conditioned as well. There are many hotels, restaurants, supermarkets, and shopping malls in Hiroshima City Center. There are also post offices and banks near the conference site. The payment must usually be in Japanese Yen currency. The credit cards of Visa and MasterCard will be acceptable for your payment at most hotels and big stores.
Telephone calls from hotels are usually more expensive.
The entry code for an international call is 001. The Japanese currency is the Yen. The service is often already added on the bill. In case of doubt ask if service is included. It is not customary to tip a taxi driver.