I thoroughly enjoyed my month in Jutta and Alexander's apartment in Berlin. It is very conveniently situated for the centre of the western side of the city and has excellent transport connections. It's a good size, easily enough for one person or a couple, and the kitchen is nicely equipped. There's an Aldi a few meters away, so you can get most basics very cheaply there; and there's a Mitte Meer round the corner for Mediterranean food and wine, as well.
I'd wholeheartedly recommend the apartment as an excellent budget option. It isn't 5-star but you'd pay a lot more for that. You get a lot for your money, though. Not just the central location. The flat is quiet. It's at the back of the building. And it has a lovely balcony with a view to the garden below. It was lovely to sit there and listen to the birdsong.
Plus I don't think I've ever had quite so much attentiveness from my hosts, who were out of the country but always in touch to check that all was well. I very much appreciated that.
Another good thing was that the internet connection was great. And there's a washing machine and an iron. as well.
Were there any drawbacks? Nothing that would make me not stay there again. In fact, I'd love to go back. There were a couple of small things, I suppose. I had to hunt a bit to find drawer space. And the loo didn't flush that well. I definitely recommend the apartment, though. I had a great stay there.