Alberto seems like a nice guy.
As for the apartment: We were not happy with what we got for the price we payed. The bathroom and the bedrooms were not clean and in certain beds were hairs from other people. Also, usage of kitchenware was not easy because the knives were stump and some pans were gross or uneven, so you could not use them. The fridge was broken (it was rather a freezer than a fridge.. we froze many veggies to death... money not so well spent :( ..).
Other than that Alberto reacted well when we told him that the coffee machine isn't working (he bought a new one and let someone bring it over) - other than that we found it weird that he never showed himself.