Julia's home is a well-refurbished apartment on the first floor of a building in an area call "Lazarus" (Łazarz). Fifteen years ago one might have felt a little unsafe there, but gentrification is in full swing. Nearby here place is a well-stocked convenience shop. On the main road (Głogowska) are a good burger place, a good Italian place, a good pizza place that serves only vegetarian pizzas, and a good vegetarian Indian place. You needn't go far to eat. Wilson Park is worth a walk around, if you have time. History buffs with an interest in the German Occupation (PHONE NUMBER HIDDEN) can see the house occupied by the infamous Gauleiter of the Wartegau (Arthur Greiser). It's at the corner of Matejki and Berwinskiego, and is now the home of Radio Merkury. Any tram going north along Głogowska will take one to Rondo Kaponiera, from which one can get public transport to any part of Poznan. Note that most public transport ends about 11pm, but there are plenty of night busses. There is a first-rate smartphone app for navigating around Poznan (and othe Polish cities): download Jakdojade. Poznan is also well-served by Uber. I did not bother with traditional taxis myself. One reason is that Uber drivers all seem to speak English, while very few traditional taxi drivers do.
Julia's apartment is lovely in a cool, minimalist vein. It has high ceilings, plenty of light, modern fittings and features, and all "mod cons," including both an ample bathtub and a first-rate shower. The guest bedroom has a small balcony, with table, chair, and ashtray. There is just a single bed (which was perfectly comfortable), but there are two matresses. Everything is supplied -- towels, bedclothes, etc. The kitchen is light and spacious. I didn't do any cooking, but I did make tea from time to time.
There was a brief cold-snap during my stay. The apartment can feel chilly at such times, but each room is separately heated by modern radiators. I never felt the cold was a problem.
There was no problem about street noise. I slept well the whole time.
Julia herself could not have been more gracious and accommodating. Her English is near-perfect (she lived in Cornwall for a time). During my stay she was always cheerful, helpful and thoughtful, a terrific host.