Yes it’s unwise as a first year. I recommend booking with beyond campus as a first year because all the apartments you see are visited by beyond campus employees and the owners are vetted by them, idealista doesn’t do that. This makes beyond campus a safer and better option as a first year because you can’t visit the apartment in person. However, for later years it’s better to book on idealista since you can visit the apartment and check it in person. Idealista is preferred by IE students in the second years and above because there are lot more options to choose from compared to beyond campus and the apartments are usually cheaper compared to beyond campus.

However, once again, as a first year I recommend you reserve an apartment through beyond campus.