We did two day tours with Traventuria during May (on consecutive days). There was some confusion when I booked the tours, on-line, as they scheduled the second tour a day later than I wanted and it needed to be shifted. My rating is based on two disparate experiences, which I will explain.
Our first tour was the private day tour to Rila Monasatery with Ani as our guide and a young man as our driver (don't remember his name, he spoke very little English). This was a great experience (see my review of Rila Monastery for additional details) in large part due to Ani's knowledge and ability to place what we saw in a clear historical context. We stopped along the way to Rila for coffee and then to pick up cherries being sold along the highway. The experience at the monastery was quite memorable (a highlight of an extended trip to three countries) and the museum there was quite worthwhile. We shopped for a few crafts by the monastery and afterwards went higher into the mountains for better views. Then we stopped at a nice country restaurant for a late lunch (local trout), which was very nice, before returning to Sofia. This tour gets 5 stars plus. Highly recommended (you can do the Rila Monastery from Sofia very cheaply with the shuttle but I'd strongly recommend going with a good guide). Thanks, Ani!
The next day were had a private full day tour to Koprivshtitsa, the Rose Valley and a Thracian tomb at Kazanlak. The tour turned out to be with two other couples, six people all together, with a guide who also drove (remember, we'd paid for a private tour). This is a long day trip (11 hours at least). The guide was a nice young man but I don't believe he'd been to either the Rose Valley or the Thracian tomb (he missed turns on the road for both and had to get directions from people on the street). The village was very worthwhile, interesting, pictureque and we met some locals; and the drive through the Balkan Mtns. was pretty. The Rose Valley experience was also worthwhile as they were harvesting the roses and we stopped and walked in the field and then interacted with the men collecting the roses for processing. Then we went on to a facility that processes the rose oil--this facility was just opening (literally their opening day) and instead of eating in their café we joined a party which included peasant music and dancing which was a lot of fun. The visit there was OK, with a short tour, nice gift shop and small museum as well as rose gardens, but would probably not be repeated by another tour --not the party and the music anyway (we were just lucky). We then drove on to Kazanlak to visit the Thracian tomb - this turned out to be a big disappointment--there is no parking lot, the facility is poorly maintained, quite a hike up deterirorated concrete steps to a building where the tomb is only to find out that you cannot go into the building--then you go to a nearby underground site with a replica (big enough to hold three or four people at a time) where you pay 5 Euros for the right to take a picture. I would rate this tour no better than 3 stars. On the way back to Sofia two of our party wanted to eat so we stopped and they ate at a Kentucky Fried Chicken spot at a gas station while the rest of us waited for them.
The guide will probably turn out to be a fine guide, but right now he is inexperienced. Traventuria would do better to visit the larger Thracian tomb site or better yet just not include it at all in their tours. We enjoyed the village and the Rose Valley (but out of season, which I believe is May-June, it probably wouldn't be worth a visit). Traventuria has a tour to the village and another that combines the village and Plodiv - either would be enjoyable.
We typically don't do tours, except day tours occasionally, but the Rila Monastery trip encourages us to do more. Traventuria has a tour to Albania and Macedonia which are two countries we'd like to visit so we will consider this for next year.
My recommendation is to be sure you have an experienced guide and if you pay for a private tour make sure that is what is provided.