Excellent stay, friendly host. The apartment has a prime location. Out the door and you're in the middle of 東區, with great food and shops.
The interior has a modern, airy feel, with tall ceilings and bright lighting. It also gets a lot of natural light and has many windows for good cross-ventilation. It feels clean and fresh.
The apartment has many little conveniences, but our favorite during our long term stay was the built-in bathroom heater, which blows hot air for 3-6 hours. It made drying clothes and towels less of a hassle in Taipei's humid/rainy weather and kept the bathroom dry after showering.
There's a water boiler, microwave, hot plate, fridge w/freezer, and a grocery store about a block away, so it's great for home cooking as well.
One thing to note, it is in the heart of Taipei's Eastern District, so sometimes it can be loud: on weekday days there is construction, and weekend nights there are partiers.