This is the 4826th most frequent Swedish word.
basel
In Swedish, "basel" is not a standard word. It may refer to "Basel," the city in Switzerland.
Here, 'Basel' refers to the proper noun, which is the name of the city in Switzerland.
Jag tycker att Basel är en vacker stad.
I think Basel is a beautiful city.
In this sentence, 'Basel' continues to serve as a proper noun, but the context suggests the usage relates to visiting or experiencing the city.
Basel som erfarenhet var helt unik.
Basel as an experience was completely unique.
In this context, though grammatically suspect, 'Basel' is playfully used to suggest deriving inspiration from the city, though this is not standard Swedish usage.