We are the first year of the course; therefore, everything is quite novel and I can't tell you yet about how classes will be conducted in Spain. I am sure you will always be able to contact somebody from KCL if you have any concerns (Robert Wintemute is responsible for the course, and he is great!). But I am also sure that there will be people in Barcelona who will support you in your studies. What I know is that we will probably be taught with another quite competitive course at the Universitat Pompeu Fabra - the Law & Economics course - in order to uphold a high academic standard.
The workload is quite heavy, although I think one gets used to it quickly; however, for us it is a bit heavier than the normal law course, given the Spanish language and law classes. I did not spend too much time on the former (although I should probably do so next year...), but the latter is quite heavy workload: you can expect an additional 4-6 hours a week (including the 2-hour seminars); nevertheless, you will not have to take a "proper" exam at the end of your first two years which alleviates the pressure from that module. More generally, I do not think that the law course in itself will be too much work; it is rather the fact that you are expected to participate in a number of extra-curriculars to enhance your CV; however, these should ultimately interest you - so you can see them as "hobbies" rather than work (I participated in a lot of moot court competitions - which I would wholeheartedly recommend!!
).
I finance my studies with a tuition fee loan, but pay the accommodation "myself" (mainly parents' income, but I contribute by working during the summer holidays). Accommodation is very expensive in London; and I think King's is one of the more expensive universities (with regards to accommodation) in London! The cheapest accommodation provided by King's is Wolfson House, where you will still end up paying 6000 pounds a year. There is also 'University of London' accommodation, which tends to be a bit cheaper but catered. And there is always the option to share rooms...
Student life at King's is certainly diverse. This really surprised me when I got here, but the majority of law students (or probably the student body in general) does not come from the UK. I absolutely love this, because you can learn a lot from a diverse group of people. One thing that King's does not have, is this "community feel" you would probably get at a campus university; it is just that you are in the middle of London and King's has four different campuses. There are still a lot of societies where you will be able to meet new people and pursue whatever hobby you may have. And concerning fun nights out, I am probably not the "right" person to ask as I have not been going out too much during the year; what you have to bear in mind though is that London is very expensive and the same applies to clubs in London. However, there are many great bars where you can drink beer for reasonable prices, and there is always the option to just meet with people in somebody's flat (if Covid-19 permits).
I do not yet hold any clear career plans; a lot of it will depend on how well I eventually do in my exams and what options are open to me. Given my participation in mooting, I am considering a career at the British Bar, but I would equally like to go into academia... King's certainly provides a great basis for any career you might end up wanting to practice. There are lots of career fairs, which allow you to network with law firms and chambers. One very special thing of the Spanish law course is also that for four or five weeks (from February to March of your first year), there will be partners from big Spanish law firms (such as Garrigues, etc.) coming to King's to present their firm, and network with us; this is only available to our small cohort! Further, from what I have heard, there will be opportunities to carry out an internship during your third and fourth academic year in Barcelona.
I can't tell you too much regarding the personal statement question as I already applied in late September to a number of British universities, and at that time the Spanish law course had not yet actually been publicised; I only later changed my choice from the normal LLB to the Spanish Law LLB.
I hope that helped!