Some objective facts about San Alfonso del Mar.
San Alfonso del Mar is not a hotel in the traditional sense but privately owned apartments that owners sometimes rent, either through an agency or by themselves. Therefore your experience with the renting process entirely depends on the particular agency (or owner) you happen to deal with. There are good ones and there are bad ones.
There are several separate buildings and usually the price is the same independent of what building it is. Choose an apartment in the newly constructed buildings. The newest building is called Crucero.
Usually bedsheets and similar type of items carries an extra charge so bring your own if you are price sensitive.
To maximize your view of the great ocean and the beautiful coastline rent high up in the building.
If you have small children make sure the balcony has a protective net.