All correspondence with Dan was promptly and very pleasantly answered - he's a very friendly and helpful guy. Unfortunately I was unable to travel in the end, but my two friends did, and were charmed by the accommodation, and wowed by the location, and were met by Dan's wonderfully welcoming father.

Here are their comments (based on a mid-January 4-day trip - to visit a friend in the local hospital and do some sight-seeing, of course, to boot!):
They felt it was definitely necessary to have their own transport, and there is indeed easy parking to be had there, but the lovely little local town, Valverdi, is only an approximate 20 min walk away. Conveniently it has local supermarkets and restaurants - however it was a rather quiet time of year so not everything was open, and it certainly seemed that most things remain closed on Sundays. However the accommodation does have more than adequate self-catering facilities, and the large terrace is a pleasure, and a sun trap even in the winter. They also loved being able to reach out over the railings and pluck the odd lemon straight from the trees!
The accommodation itself is rustic, but very cute and, as you're in the hills, the views of the surrounding countryside and out across the sea in the distance, are stunning. It can sleep up to 4 (preferably 2 couples), but as it's quite intimate, it's perhaps preferable for just a couple - or 2 friends - one on the downstairs bed, and one up on the mezzanine. It does get chilly up in the hills this time of year but, thankfully, the air conditioning unit also, conveniently, heats. The only thing they wanted to mention, though, was that the bathroom is really a wet room and thus pretty small. That that didn't really bother them for the few days they were there, and they thought that it would be no problem at all in warmer weather. It was a good plus too, to have internet available!
All-in-all they had a lovely stay and would recommend it. I hope I get the chance to visit too, sometime :)
Thank you!