I visited the Ueso pousadas in June 2010. June may not be peak season in the Pantanal but I thought it was an ideal time of the year. There was only a small number of tourists, the climate was extremely pleasant (especially after leaving the Melbourne winter behind) and there was plenty of wildlife to see, which is of course the main attraction of the Pantanal. Especially the birdlife is spectacular, but there are plenty of other critters to see (caimans in every puddle, capivaras, deer, ant eaters, monkeys etc) Sonia und Ueli, the owners of the pousadas are friendly hosts and extremely knowledgeable about the wildlife, as was my tourguide Pawane. Both of the pousadas I visited (Cerrado and in the actual Pantanal) offered simple but very comfortable accommodation and a very pleasant, laid-back atmosphere. Every day a different tour/activity is lined up (horse-back riding through the bush, piranha fishing, etc) . I was only there for five days in total but would have liked to stay longer. I can thoroughly recommend the place.