In most cities you’ll be perfectly fine if you only speak English. In some regions it is best to have a translation app as a backup.
The currency of Spain is the Euro.
As of June 2020 the exchange rate is: 10 EUR equals 11,21 USD, 16,29 AUD or 9,03 GBP.
Credit Cards & ATMs
In the cities you can use a credit card at most locations. In regional Spain it is best to have some cash on hand as some businesses do not accept card payments.
It is best to bring a MasterCard or Visa card, as AMEX is not yet generally accepted.
Type C and Type F
The voltage is 230 V and the frequency is 50 Hz.
Whether or not you need a visa to enter the country and how you can get one depends on a lot of factors. Citizens of EU countries, Switzerland, Iceland, Norway and Liechtenstein do not require a visa if they stay in Spain for less than 90 days.
You can find all information about the entry requirements of Spain on the website of the Spanish Foreign Ministry.
Spain is a relatively safe country and perfect for solo female travelers. Beware of pickpockets and scams in bigger cities. It is recommended to keep your valuables close and to try to lock your bag.
While unlikely, it is best to always be aware of your surroundings as Europe as a whole has been the target of terrorist attacks.