Hi Anahoj!
I hope you are well and not getting too nervous or worried about the build up to uni life - you'll have a ball i'm sure. I am a current Psychology BSc student here at York, and it's personally the best decision I've ever made.
As Professor Peter Thompson mentioned, there are a number of blogs you can read from a Psychology student, written for prospective students like yourself so do visit those. There is also an interview with Pete in there so you can get a sense of the student-staff relationship, the support and encouragement we receive from staff in our department is really very special.
You mentioned the prices of living in York being higher, but I wouldn't say that is true. There are around 9 college choices for accommodation, all at varying price and standard so that you can choose an affordable, but nice, place to live whilst here. Being a campus uni, there is a lovely sense of community and especially in Psychology as we have our own department - so every day you come to the building you'll recognise students and staff as they all form the Psychology community.
It is also beneficial for you to bear in mind that University of York is a Russell Group university and so is considered very valuable on your CV and job applications.
Take a look at how the courses are run too; in York, we learn a huge variety of aspects relating to Psychology for 2 full years before branching off - so you're not pushed into making decisions too early on. We also get the opportunity to carry out 4 mini project experiments of our own within our first 2 years - your very own research projects! It's professional and exciting and is a great addition to your CV.
We have a huge group of students enthusiastic to represent our University, and particularly Psychology, on open days as we are all so proud to be a part of this incredible, world class, research department. We get taught by Professors who literally wrote the books we learn from!
But as Pete said, I'm sure you will make the right decision for you and enjoy your University years.
Best of luck!
Katie