nice
Nice, likable, attractive.
she is nice
the teacher is stupid
Tu es un type très sympa means "you're a nice bloke / guy" in French.
'C'est sympa!'
"tu a le sympa" = "You have the nice one" But I think you made a mistake, just know that "tu es sympa" = "You're nice"
you are also nice.
bien, gentil/gentille, sympa
You say "likeable" in French as "aimable" or "sympathique."
"Thank you! He also is very nice!" is an English equivalent of the French phrase Merci! Il est très sympa aussi! The pronunciation of the phrase in the third person masculine singular of the present indicative -- which also translates as "Thanks! He's really nice as well!" -- will be "mehr-see ee-leh treh seh-pa o-see" in French.
un ami / une amie sympa/sympathique
c'est gentil, (that's nice in francais!)if you want help on french in the future, just go on google translater or babel fish(: