I had the absolute pleasure of staying at Andrea's place during my time in Amsterdam. The space is perfect for one or two people with plenty of room and close living quarters to feel cosy and safe. The flat is beautifully decorated with a simplistic but stylistic approach. The bed is very comfy, (I slept like a baby the first night!) With a small window to look out out onto Javaplein.
The bathroom is right next to the bedroom free to use at your own leisure as Andrea living quarters are downstairs. There's is never any bother from the host, Andrea lets you get on with what you want to do, but it's important to note that Andrea's place is for going out for the majority of the day, taking it easy, getting ready in the morning ready to leave and coming back whenever after 5 as she has to work and what not to do her own thing in the day. So no staying around the apartment, get up and go explore Amsterdam!
Furthermore, Andrea is such a lovely, kind and heartwarming person to meet, she is so helpful and happy to talk about anything you might have to ask during your stay. She makes you feel welcome and that's what makes a great host. Note: if you're unsure about anything, whether it's about transport, where your staying, how it works between you and the host, or anything at all, just ask Andrea! Communication is key, as it will make you and your host have a better relationship and understanding of eachother.
In terms of distance from Amsterdam Central, you can easily get a bus or tram that will take you into the heart of The city. It doesn't cost much and it's easy to follow, you will need to pay on card but you can buy a day pass or one way whatever's easiest, both are cheap and worth it. I myself walked a majority of my trip to the Centrum as it was nice discovering the city and taking it all in as I explored around. The walk is about 30 mins to 40 mins, and about 10 to 20 mins via bus or tram.
The area Javaplein is nice and clean, with coffee shops and cafes all on your doorstep. A calm and quiet area makes a lovely rest from the busy centrum.
Overall, my stay couldn't have gone any better, I am so grateful and lucky to have found Andrea's place and I'll be sure to visit Amsterdam again!