What is the cost of living like in El Salvador? How much would it cost to rent a one bedroom apartment in an upscale neighborhood there?
I think the cost of living in El Salvador is much lower, for example when compared to the US. However, I'm pretty sure that it can vary from place to place within El Salvador. For more detailed information you can refer to the Ministry of Foreign Affairs in your country as Litzki1990 suggested.
I think you can also conduct your own research on Google where you are likely to find accurate information. This
website provides a lot of data about the cost of living in El Salvador. You can check it out for more information.
The cost of living in El Salvador is supposed to be several times less than the cost of living in America. But the cost of staying there depends on how you stay. That is, if you want to be a citizen of that country, it may be a little easier for you to stay, but if you plan to collect a visa from your country's embassy and live in that country, the cost of living and eating may be higher for you. However, the Embassy of El Salvador or your Ministry of Foreign Affairs may be able to assist you with more information on this matter than we can.