My wife and I stayed 6 days at Ivonne's place. The apartment is really great with a comfortable living room to hang out in, a very comfortable bed with plenty of pillows to choose from and a fully stocked kitchen to cook in. The location is ok since it's on a fairly quiet street and it's close to a few supermarkets and some restaurants but it is a bit of a walk down to the Old Town and to the newer downtown area.
The best part about the apartment is Ivonne herself. She was kind enough to pick us up at the ferry port and to even drop us off at the airport when we were leaving. She is super friendly and left us some snacks and items for our breakfast in the fridge. Unless you're super set on being in the old town you definitely need to book here.