Rita, I have found guava (Psidium guajava) easy to grow, very undemanding. Like the majority of our fruit trees it is on drip irrigation that is turned on twice a week during the hottest months. Apart from the fruit the tree is worth growing in its own right. The flowers are beautiful, as typifies the myrtle family, and the trunk is attractive with its peeling bark.
The Pineapple guava (Acca sellowiana) I grew from seed bought from Chiltern Seeds in UK about 14/15 years ago. From, I seem to remember, 7 germinations I kept 4. Again, they are well worth growing for their ornamental value. Mine have been kept as rather sprawling bushes but I have seen them growing as medium-sized trees on the boundary of one of the Cyprus Agriculture Departments Research Farms. They are reasonably drought-tolerant, moisture-tolerant, salt-tolerant enough to be grown in coastal areas and unfussy about soil type. Stunning flowers with slightly fleshy petals that are edible and can be added as an unusual decoration to fruit salads. My bushes took about 5 years to fruit and now produce far more than we can possibly eat. It's hard to tell when they are ripe as they don't undergo any colour change. I believe the recognised method of harvesting is to shake the plant and collect what falls off. I find the taste difficult to describe. The ripe fruit are initially sweet with a flesh that can have a slightly 'gritty' texture and they have an unusual aftertaste. This I find a little sharp, but not unpleasant, possibly akin to that experienced with pineapple. I read somewhere that it was like wintergreen. Anyway, I can thoroughly recommend growing Acca either for the fruit or simply for ornamental reasons.