The phrase "is nice" is so commonly used that it can become repetitive and lose its impact. To add variety and depth to your language, try using synonyms such as "pleasant," "enjoyable," "delightful," "charming," and "agreeable." You could also consider more specific words, like "gracious," "kindly," "amiable," "affable," or "cordial." These alternative phrases not only showcase your vocabulary but also convey a more nuanced expression of your opinion. By using synonyms, you can avoid redundancy and bring a refreshing flavor to your speech or writing, allowing your audience to appreciate your mastery of language.