Sagrario is a lovely person who will be there for you any questions you have. She sent me links with the best things to see and to do in Valencia during my staying there. She's very friendly and it will make you feel at ease.
The flat is in the old city, so it's close to everything. Being so central, expect to hear some shouting from drunk people during the night though. The room is big, with a big bed, closet, and a work table.
There are three more rooms in the flat, so you can meet other travellers and make some friends if you stay long enough.
I'm happy this was my first flat in Valencia because I've met Sagrario and also made another friendship there! :) I recommend!