Shirley's space is a spacious studio apartment in a nice, low-rise residential district. It's close to the EW line on the MRT and so easy to get to and from Changi (though the taxis are cheap, too). EW goes all the way out to Jurong and it's one of the most useful lines. Kembangan Station is just a short walk away. The immediate vicinity is residential, but there are shops and eating areas an easy walk away if you need something locally.
The apartment itself was spotlessly clean, with good air-conditioning, a comfortable bed and an up-market bathroom. No serious cooking allowed, ample facilities for basic needs (e.g. breakfast); but who cooks in Singapore when the outside food is so good? It was perfect for my stay -- irregular program, visiting different areas of the island, needing to come back to calm and comfort.
Shirley was a truly great host. She provided a lot of useful practical information on getting to the apartment and managing in Singapore. She checked that everything was fine without intruding. Highly recommended.