We stayed here for only one night altough we wished to stay more.
The room was spacious and very clean, with AC and an amazing balcony (quite big) with a great view to the Meteora complex of rocks...simply amazing view.
The host was very very nice and friendly, made us some free sandwiches before our departure and took us for free to the train station.
Very good prices at their tavern downstairs (for example we ate for 5 euros per person wich included a sandwich, a spanakopita, a pie with cinnamon, water, tea and coffee and more than just a cup).
And the little town of Kastraki is beautiful and cosy, we loved it.
And also it's very near to the meteora complex, you can really walk to the first monastery (St. Nicholas), but the rest you should go with a car.
The bus that goes to monasteries stops 10-20 meters in front of the guesthouse.