We found the house quite spacious and comfortable, for two people. The kitchen is reasonably well equipped, but offers no supplies; if you want salt or pepper you'll have to buy some. The outside areas are not overlooked, and pleasant to sit in, though if you want to sit on the bench you have to take the cushions out and bring them back in every time. The pool is good quality, but the shallow end at 1.2 metres isn't all that shallow.
The area is quiet, and a good base for getting around the island with a car. There is a small supermarket nearby and a big one 7 kilometres away on the edge of Arrecife. Teguise is 3 kilometres away, a characterful town with good eating places (we liked La Cantina).
Chris, the manager, is thoughtful, capable, reliable, interesting, cheerful and a great source of knowledge about the island. So visitors will certainly be in very good hands.
Good value for the money, which applies to the car as well. It's £25 a week for wifi; that may seem odd, but Chris explained the reason for it to our satisfaction.
We had an enjoyable fortnight, and definitely recommend Casa Lulu for two people, but can't comment on how it would work for three or more.