I loved staying at Andy's! I walked all over Paris from there. It is not too far from Arc de Triomphe, Montparnasse, and Pigalle, so most travellers could walk that if you enjoy walking. You can find self-guided walking tours of Montparnasse online that are very helpful as there are interesting historical sights there. I also walked all the way to other neighborhoods in Paris that were about an hour away (including to the Louvre, Eiffel Tower, and Center Pompidou), because I enjoyed seeing the city by foot. Very convenient to subway though, so if you don't want to walk all over the city you definitely don't have to, and I took the train several times!
Andy met me upon arrival, and speaks English, so helped me get settled in. (Je ne parle pas francais, at least not very well). I found it quite amazing and inspiring that he lives in such a small space year round when not renting it out! It is well laid out and set up for guests, and I had a cupboard to keep my stuff in and the fridge, microwave, and burners allowed me to make some of my meals there. Lots of great local neighborhood restaurants and bars nearby too. I could see the Eiffel tower lit up at night from the balconette, which, though small, was one of my favorite parts to be able to sit outside and/or have the door to the apartment open to the fresh air. Finally, you can't beat the price! It's not a 5-star hotel and didn't feel like one, but it felt like staying in Paris like a local--or maybe like a student studying abroad and living in a small space. I would stay again in a heartbeat and save my money to explore Paris instead of spending it all on lodging! Also, the nearby boulangerie/patisseries were delicious, as was the restaurant Talos on the same street as the unit. I recommend it!