We loved this apartment. It had the feel
of an up-market hotel due to its style, cleanliness and quality (eg plush white towels). It is close to transport, so that even when we arrived by train with loads of luggage we were able to wheel them to the apartment. Most tourist spots are within walking distance but despite being so central it is a quiet street. On our first night we went to a concert at the Teatro dell'Opera which is less than a 5 minute walk away.
Although we didn't meet Martina, she made us feel welcome and that she was available if we needed help in any way.