Lay My Hat

Hi

We have our appartment that we are renting to tourists on differents platforms (the place is in Sweden) and want to start to have our website

Should we use a .com or.se for our website? . What is the best for SEO?

I forgot to say that we will have different languages as swedish, english and french

Simple answer. If most of your guests are coming from Sweden, then .se is good, otherwise .com

In a world press it it better to have the .com for the english language part of the website and .se for the swedish language part or maybe not possible on this way?

Maybe this will be of help:
https://moz.com/learn/seo/international-seo
Maybe purchase both. Do not double up on content just have one on Permanent Redirect.
There are tricks within CSS to auto divert viewers to the right language. Personally when visiting a website I prefer that I change the language, if I want to.

Thanks for the advice

I will buy both.