Location of cities and buildings
Hello/Hola,
When describing the locations of cities or buildings, is it best to say "en" or "esta/estan"?
For instance, can I say:
"Mi novia y yo viven en Londres. Es una ciudad esta Inglaterra de Sur, y el Reino Unido."
or
"Mi esposa y yo son alumnos a una universidad en Nueva York. Esta universidad tiene una libraria buena en Manhattan."
I have missed out the accents, and I apologise for this as I am pushed for time currently.
tl;dr, can "en" or "está/están" be used interchangeably for locations?
2 Answers
Well "en" is necessary in all the cases.
When you make reference about a only person is: Está. (Está en)
When you make reference about your friends or you want to speak in plural is: Están. (Ellos están en)
And when you're with them is: Estamos (Nosotros estamos en )
"Mi novia y yo vivimos en Londres. Es una ciudad esta Inglaterra de Sur, y el Reino Unido."
"Mi esposa y yo somos alumnos a una universidad en Nueva York. Esta universidad tiene una librería buena en Manhattan."
I can't improve on Gex's response as he is a native speaker 
I would, however, like to add that sometimes you can for example say, when talking about buildings and objects like squares, market places etc...
La embajada Brtiánica en Perú está situada (o ubicada) en la plaza Mayor en Lima.
= The British Embassy in Peru is situated (located) in 'Main Square ' in Lima.
This is only intended as an example of how you can use the words situada o ubicada to describe the location of a building, such as a post office or police station and is not intended as a statement of fact! 
By the way, are you aware of the differences in meaning between the words for library and bookshshop in Spanish? Did you mean to use libraría = bookshop?
bibiioteca = library but librería = bookshop Many people are caught out by this including many intermediate-level students!
I hope this helps
