Stayed here for 4 days and it was unbelievably good experience. I didn't expect anything of such high quality and pleasantness First of all, the host Pavlos was very welcoming and gave lots of useful tips that made my tour of Meteora full of events. Due to him I found out about not working but still existing chapels in the mountains and hiking paths to them. Breakfasts were delicious and time could be chosen depending on your plans. Clean and nicely-decorated room with balcony. It was an extreme pleasure to sit on the balcony in the evenings enjoying the view on Meteora. Next to the guesthouse there is a restaurant of the same host.
The only doubt can be a location. For me it was perfect: the guesthouse is one of the closest to Meteoras so they can be easily reached on foot: 5-minutes walk to Agios Nikolaos Anapausas, 20-minutes walk to Roussanou etc. So I enjoyed my foot-trips greatly. But if you are not prepared for walking much and prefer bus - then you will have to go back to Kalambaka or somehow organize you being picked up from Vavitsas on the way to Meteora (all tourist buses and cars pass the guesthouse as it is near the main road to all Meteora monasteries). Don't worry - at night it was absolutely quite, because all traffic stops soon after sunset.
Also for you to know - there are some dogs at the way to the first monastery. So if you are going on foot, you may be frightened by their look, but don't worry, they don't pay much attention to people. I passed them many times and never had troubles. However, I never did it until dawn.