It would be a pretty obvious answer, but the best place to meet a single girl in Sweden is the capital, Stockholm. People can speak English fluently, women in the capital are more open to meeting and dating foreigners, and maybe you’ll find big-city girls more fancy and sophisticated.  However, if you have skills in Swedish, you should visit magnificent Gothenburg and ancient Uppsala as well. The girls there are more simple and no less intellectual. Be ready for their confusing but very engaging dialect!