Margarita's place is the epitome of the best bargain you can have in Santorini. Her room is cozy, has its own bathroom and even has a separate entrance. This is extremely important for tourists because of privacy and even though the common area is shared, Margarita's family is so friendly, nice and humble you will want to cross paths with them. A couple of times my girlfriend and I were drinking wine or were exhausted from the hiking trail (that must be done) and her family would bring us cheese plates, or fruits which was a great gesture from them, but speaks volumes of the type of people they are. In the guest house there were people staying and we met a lovely family from North Carolina which were extremely friendly as well.
One really good tip I will say for people coming to this location is this, her property is walking distance from Oia (Caldera views), but has the tranquility that Oia will not have because of tourists. As well, the caldera views are great during the morning (sunrise) and day but there is one caveat that Margarita's property takes care of which is the sunset. From the caldera view of direction you truly do not have a sunset, from Margarita's property you can see the sunset every day which is awesome and a magical event one has to behold in person. This property as well as her other property in Oia (for bigger families) are the greatest properties in Oia; considering views, price and hospitality.