Comment (type:'comment')

Source code: Survey setup
Survey.defaultBootstrapCss.navigationButton = "btn btn-primary";
Survey.Survey.cssType = "bootstrap";
var survey = new Survey.Model({questions:[{ type: "comment", name: "suggestions", title:"What would make you more satisfied with the Product?" }]});

survey.render("surveyElement");

Rows: (default is 3)

var q=survey.getQuestionByName('suggestions');
q.rows = yourvalue;
survey.render();"