We had a fantastic 4 days/nights at Machteld's. Machteld was very quick to respond to questions before and during our visit, and gave us some local tips.
She provided really nice coffee for the filter machine, plus some tea for when you arrive - there is milk with breakfast, which was enough for a couple of teas and a coffee, plus there were some UHT milk pouches if you need them when you've just arrived. There is also a good supermarket 3 minutes walk away (Albert Hein), so we stocked up to cook for ourselves and bought some extra milk. The kitchen facilities are good - the microwave is part of the oven, in case you can't find it.
Breakfast was delicious and filling. Machteld was happy to provide vegan food for my partner. The eggs came from the chickens in the garden, so they don't come much fresher.
The room is very large and despite being between -6C and about 0C in Rotterdam all week, we were always warm. The water was always hot and the shower very good too.