We had a wonderful stay at Botanical Studio. The communication from Eugenia and Anna was excellent and everything was as described/pictured. The flat is around 25 mins via taxi from the airport and cost just over 20 euros. The building is lovely and quiet and approx. 15 mins walk to the Piazza. Eugenia and Anna have thought of everything, the studio was well equipped with what you'd need (plenty wardrobe space, towels, blankets, coffee machine, utensils etc).
Although the centre isn't far, we really enjoyed some local eateries and bars. We'd recommend L'e Bon (a few mins walk away) for takeaway (it's very small) we had their sausage and cream pasta and pork cheeks with plum and they were amazing, Forno Brisa (5-10 mins away) for delicious coffee and pastries and Vasiniko for the best pizza ever (4 mins walk away). Just next to Vasiniko there is a little unassuming bar called Bar 44. We absolutely loved it there - a perfect place to practice your Italian as the very friendly owner speaks no English, it's filled with locals and has very reasonable prices (half the price you'd pay in the city centre).
Bologna is a stunning city and Botanical Studio is the perfect base to explore it from.
Thoroughly recommend and we are already planning a return trip!