Alfonso's place is well located, and is very close to a bus and tram station. Central Oslo can be walked to in 20 minutes, as can a number of museums and other attractions. The location is also very close to a number of restaurants and shops.
The location is reasonably quiet, and there wasn't too much traffic noise. The neighbouring apartments were also quiet.
The apartment is on the top floor and has an angled ceiling, so taller guests will need to remember to watch out when around the kitchen sink. The view however is quite nice and makes up for the one or two times I bumped by head.
I didn't meet Alfonso in person, though we did talk on the phone. Kari was there when at check in, and both she and Alfonso were extremely friendly and helpful. Overall I would definitely recommend Alfonso's place to people visiting Oslo.