code: function getReviews(userId, options) {
    var DEFAULT_REVIEWS_PARAMS = _.assign({}, configs.DEFAULT_REQUEST_PARAMS, {
        page: 1,
        role: 'host'
      }),
      searchOptions = _.assign({}, DEFAULT_REVIEWS_PARAMS, options),
      requestConfigs = _.assign({}, configs.DEFAULT_REQUEST_CONFIGS, {
        url: configs.USER_REVIEWS_URL + '/' + userId + '?' + serialize(searchOptions)
      }),
      reviews = [],
      $;
  
    return new Promise(function(resolve, reject) {
      if (!userId) {
        reject('Invalid user ID');
      }
  
      request(requestConfigs, function(err, res, body) {
        if (!err && res.statusCode == 200) {
          var data = JSON.parse(body);
  
          if (data.success) {
            try {
              // Since the res is in HTML, parse with cheerio
              $ = cheerio.load(JSON.parse(body).review_content);
              // Construct list of textual reviews
              $('.comment-container .expandable-content p').each(function(idx, $review) {
                reviews.push($review.children[0].data);
              });
  
              resolve(reviews);
            } catch (err) {
              reject(err);
            }
          }
          else {
            reject(data.error);
          }
        } else if (err) {
          reject(err);
        }
      });
    });
  
  }
docs: Get a list of textual reviews for a given user, as a host or a guest
  @param  {Number, String} user - User ID
  @param  {Object} options - Options to specify page and role of reviews
  @return {Promise} - contains list of reviews
  
  options = {
  page: {Number}, default 1
  role: {String}, Either 'guest' or 'host', default to 'host'
  }