Eva is perhaps the coolest host I’ve ever met! She’s a great person + very communicative and shared good tips with us for vegetarian (and not only vegetarian) eating in Donosti. The place is lovely, clean, in a central location full of bars and cafes, the balcony is a nice spot for a morning coffee with a book.
Parking-wise, try one of the (paid) underground parkings in the area (eg Katalunia) or park in the free Illumbe parking in the outskirts and take the 20min journey by public transport to the centre.