The "Happy house" is in an amazing location, probably one of the best in Sevilla, and if you are lucky, you will have some great housemates! The house has 16 bedrooms, which is not obvious or clear from the individual room descriptions. There are enough bathrooms on each floor, so you are rarely waiting to use the bathroom.
The kitchen is kept clean, but there are only 3 stovetop cookers, so you sometimes have to wait if you need to cook. The fridge space per person is tiny, so you can only buy a small amount of groceries at a time. The house is cleaned 3x a week, but this is only the basics done in the communal areas. There is only 1 washing machine, so you will often have to wait to do your washing.
The house is really traditional and has some beautiful elements to it, but there is a lot of potential to improve (e.g. fixing broken door handles, broken cupboard doors etc). Most of the housemates are really lovely, and there is a great rooftop to chill out on!