Well, I'm in the process of having one fitted so I have some info.
Wood burning is not the same as "solid Fuel" which could mean coal. Wood burns from the top, coal burns from the bottom, so stoves are either Wood or Coal or "Dual Fuel" where the grate can be moved up or down or vent opened or closed for appropriate burn type. In Canaries, I can't imaging they would want coal, but also do they have much wood to burn ?
Next, steel or cast iron. Cast are heavier, but in reality steel are ok. I've having steel, and it's damned heavy. Hate to think how heavy cast is.
Ventilation/flues. Absolutely crutial. In the UK there are strict rules etc, but it is quite possible to kill people with bad ventilation.
Heat Output. Stoves are rated by Kw, the amount of anticpated heat output. 5Kw is good for a decent size room. Higher Kw rating is NOT always better unless you live in a shed in northern Norway or something. If something visual is wanted and a decent bit of heat 5Kw is fine for a good size room. More than 5Kw might be ok for a big open plan room or maybe a hall.
If you buy 2nd hand make sure it's not all tarred up. Some people burn unseasoned wood and the resin coats the inside of the stove. Potentially lethal due to carbon monoxide poisoning, as with ventilation/flues.