This flat has met all our expectations: it is located nearby the center (cca. 10 min. on foot), close to a major metro station but not in a touristy area. The street might be a bit noisy, but the windows are very good and thick and we did not hear any noise once they were closed.
It is nice and modern, comfortable for a weekend - the balcony was definitely an asset, and having a glass of wine on a warm spring evening was extremely pleasant.
I would recommend the flat to any person on vacation or a business trip. Thank you Diego!