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Hello, firstly I would like to say that I've found this web site this month and it seems absolutely/totally interesting. I'm looking for someone who really likes/wants to learn or improve their language skills with me. I am sSpanish and I would like to know meet somebody/one in order to speak with him or her. I only want to meet with him/her twice a week and we could share our knowledges meanwhile we can talking about every interesting thing. I think it could be a good idea. Tell me if you would like...

This is good expression here Pedro. I have used the / to suggest another word, perhaps better, that you could use. ¨Totally interesting¨is more natural. "Wants" is better than "likes" here as "want" indicates a stronger intent to do something. "Somebody/one" is more or less the same. 

"I only want him/her.." is ok grammatically, but the "register" is not right. "I only want him/her twice a week" can be softened by stating the intent: "I only want to meet with him/her..."