Booking the property was great. We booked instantly, and the property manager was very communicative. We had to book at the last minute, so it meant a lot to us to feel confident about our booking.
The best thing about this property was the location--it was very close to the Grand Canal and only a 5 minute or so walk to the water bus. But it was also just above restaurants and shops, so it was very noisy, and the noise went late into the evening. If you're a light sleeper or just jet-lagged, it's something to consider. The twin bedroom is closest to the street, so it may not bother you if you're using only the double bedroom.
The unit was very clean, and the kitchen adequately stocked.
In the double bedroom, the bed was horrific--it was like sleeping in a hammock with springs. The beds in the two twin room were okay. The linens were clean and plentiful enough.
There were mini-splits in the unit, so we were able to keep every space at a desirable temperature.
The shower was very small (not uncommon for Europe, though), it didn't have a place to put any toiletries, and the shower door didn't close all the way. So the bathroom floor stayed wet. The tub had a wand, so you might opt for that instead.
The furnishings for the apartment were quite possibly the cheapest I've ever seen. We really just needed a place to sleep and shower, so it wasn't a problem for us. But if you require a "nice" place to stay, or even if you just want furnishings consistent with the price we paid, I wouldn't recommend this space.
Regarding check-in, the property manager was very communicative. However, we had to pay 50 euro extra to check in after 7 pm. If you're going to run a short-term rental property, I don't think it's reasonable to expect travelers from all over to be able to check in at 7 pm. If you're going to run an inn, especially at these prices, that's a 24x7 job. It would definitely make me consider a hotel room instead.
So my overall rating is mixed and very much a function of our specific needs. Your experience may vary.