I used Erasmusu for booking accommodation in Rome and unfortunately, after my payment the landlord canceled the booking. As I never used such services before, I was scared that it's a scam, however decided to stay patient and keep in touch with the support team. Unfortunately, we couldn't find anything to book instead of the previous accommodation, but the support team tried to help me. I sent them a lot of links of the accommodation I liked, but all of them were already booked. However, it was also my fault because I should have booked it beforehand, not 3 weeks before going to the city with such a high demand for rooms and flats. Finally, I asked for a refund and my support agent told me that it can take 5-15 days to get it and the service immediately sent me a bill. I received a refund in 2 or 3 days so I still had time to book accommodation.
It could be much better if only available accommodation was posted on the website and all the others were deleted immediately after being booked. Also, probably the company's policy provides one email from the support team per day, but this is a little inconvenient as it takes more time to solve a problem. This is why i give Erasmusu 4 stars.
Few support workers contacted me after my booking got canceled, but special thanks to Giulia who checked the links that I sent her quite fast, also suggested me some options, and helped me to get a refund in a couple of days :) I guess if I booked accommodation on Erasmusu beforehand, it would work.